I need to have an MHL adapter connected to my Samsung Galaxy s4 i9506 which mirrors it's screen to a monitor/info screen indefinitely, but the problem is that an MHL adapter outputs a measly 300mA (Tried lots of chargers but the output never changed) which is nowhere enough. I did some research and found out that I can up that number by installing a custom ROM that enables fast charging so tried that with my other phones doing the same task that are i9505 and SGH-M919. I managed to install a custom ROM that enabled fast charge through STweaks which upped the output all the way to 1000mA, but I haven't been able to find out a ROM that enables the feature for i9506. I tried LineageOS 14.1 which should have fast charge enabled by default, but when I used Ampere to check the charging current the output was 300mA, so I assume that fast charge didn't get enabled.
Does anybody know a ROM, that enables fast charge for i9506, or how I could scrape by with that measly 300mA when the only thing the phone needs to do is to mirror a web page to a monitor. Chrome cast isn't an option, because if the connection drops you need to manually connect it again, and since the phones should be operational for months without rebooting the connection is bound to drop sooner or later.
That's a kernel thing. So, unless you find a kernel for the I9506 that supports 1000 mAh USB charging, you're out of luck in this regard.
I guess the only way to survive with 300 mAh would be to turn the screen off, otherwise the phone will use more power than it receives.
Another solution would be wireless charging. I think this is your best bet.
Is there an app that I could use that timers off the screen during the night and then wakes it in the morning? There are a lot of apps that let you time music and other apps, and even turn off the screen, but I haven't found one yet that could also wake the phone up later.
nyoatype said:
Is there an app that I could use that timers off the screen during the night and then wakes it in the morning? There are a lot of apps that let you time music and other apps, and even turn off the screen, but I haven't found one yet that could also wake the phone up later.
Click to expand...
Click to collapse
Maybe Tasker.
@nyoatype
I'm searching for same as you.
Having mhl adapter (which is original as i think, working without power source and resolution is 1080p60). After connecting to AC 1.2A max charging power for phone (I9505) is only 300mAh, on original Samsung charger 2.1A is little bit more - 400mAh but obviously it's still not enough for me. Power output doesn't change even after enabling USB fast charging (700mAh or 1000mAh, doesn't matter).
I was looking to kernel source https://github.com/Slim80/Imperium_...ter/arch/arm/mach-msm/board-fusion3-battery.c
where are defined values of charging for MHL 500/MHL 900/MHL 1500 (phone probably can detect which one is plugged) but after increase charge_current_max and charge_current for every MHL type I do not see any difference unfortunately, so I'm searching still what's is going on and where i can increase power output from MHL to phone.
I'm searching for a way to change resolution of MHL video output too, so if anyone kernel master can follow me a little bit, will be great (maybe here https://github.com/Slim80/Imperium_Kernel_TW_5.0.1/blob/master/drivers/video/msm/external_common.c in line 40 -
HTML:
int hdmi_forced_resolution = - 1 ;
)
PolishVodka said:
@nyoatype
I'm searching for same as you.
Having mhl adapter (which is original as i think, working without power source and resolution is 1080p60). After connecting to AC 1.2A max charging power for phone (I9505) is only 300mAh, on original Samsung charger 2.1A is little bit more - 400mAh but obviously it's still not enough for me. Power output doesn't change even after enabling USB fast charging (700mAh or 1000mAh, doesn't matter).
I was looking to kernel source https://github.com/Slim80/Imperium_...ter/arch/arm/mach-msm/board-fusion3-battery.c
where are defined values of charging for MHL 500/MHL 900/MHL 1500 (phone probably can detect which one is plugged) but after increase charge_current_max and charge_current for every MHL type I do not see any difference unfortunately, so I'm searching still what's is going on and where i can increase power output from MHL to phone.
I'm searching for a way to change resolution of MHL video output too, so if anyone kernel master can follow me a little bit, will be great (maybe here https://github.com/Slim80/Imperium_Kernel_TW_5.0.1/blob/master/drivers/video/msm/external_common.c in line 40 -
HTML:
int hdmi_forced_resolution = - 1 ;
)
Click to expand...
Click to collapse
I used this ROM to up up my numbers with i9505 to 500mAh-640mAh depending on charger and mhl adapter, so if it's of any help to you you can try it. Let me know if you find anything that could be of use : D https://forum.xda-developers.com/ga...dcteam-android-source-project-mra58v-t3251663
Is there any way to wake phone up with a timer? For example make the phone wake up every morning at 8 o'clock? I'm using automate to put the phone to sleep at a fixed time, but waking it up doesn't seem to be as easy (The timer block in automate actually has a checkbox with description "Awake device", but it doesn't actually wake the phone up).
nyoatype said:
Is there any way to wake phone up with a timer? For example make the phone wake up every morning at 8 o'clock? I'm using automate to put the phone to sleep at a fixed time, but waking it up doesn't seem to be as easy (The timer block in automate actually has a checkbox with description "Awake device", but it doesn't actually wake the phone up).
Click to expand...
Click to collapse
I already told you to try Tasker. Did you do it?
Pwnycorn said:
I already told you to try Tasker. Did you do it?
Click to expand...
Click to collapse
I haven't yet added a payment option to Google store (Since this is work related and I'd need to use the companys payment information) so haven't been able to try Tasker. I'll try it when I'm able to get my boss' approval.
I'm also trying to do some physical changes to one of the MHL adapters to bypass it, so that the current would come straight from the charger. This means I'll cut the Power and GND (red and black wires) of the microUSB cable connected to the phone and connect them in parallel with the red and black cables going to the MHL adapter. I'm not sure, but this might cause the MHL adapter get power from the charger, but instead of supplying the power to the phone, the phone would get it's power straight from the charger (although it would still be USB-charging since the data pins are being used, but that wouldn't matter since I usually get 1000mAh when USB charging with computer).
Another possible solution is to use wireless charging pad, because I read that if the USB-connection uses MTP or PTP the wireless charging will take priority, so the data would go through the USB but the power would come from the wireless charger. I'm not sure about this because I read it from another forum post, so if somebody could confirm/deny it I would be seriously grateful!
Thanks for your replies and suggestions so far! This is one heck of a situation I've been put into so I really appreciate the help!
Related
Just got a new motheboard which has high output USB charging for iPhones, pads etc.
Can this work on N1 ?
http://gigabyte.com/MicroSite/185/on-off-charge.htm
edit: driver link is at the bottom for all the hackers. Hopefully its just changing string from apple to android hehe
kazprotos said:
Just got a new motheboard which has high output USB charging for iPhones, pads etc.
Can this work on N1 ?
http://gigabyte.com/MicroSite/185/on-off-charge.htm
edit: driver link is at the bottom for all the hackers. Hopefully its just changing string from apple to android hehe
Click to expand...
Click to collapse
Hopefully not, I dont want my nexus one to be iphone.
But as you know nexus one is using qualcomm motherboard.
But aslong cyanogen and fm transmitter is working there is no problem wiith your phone.
Dear lord what a crappy reply. Stick to disney mate.
It should, it basically just converts the USB port from .5 amps to 1 amp, like a wall charger.
elkyur said:
Hopefully not, I dont want my nexus one to be iphone.
But as you know nexus one is using qualcomm motherboard.
But aslong cyanogen and fm transmitter is working there is no problem wiith your phone.
Click to expand...
Click to collapse
WTF??? May want to lay off the halucinogenics
elkyur said:
Hopefully not, I dont want my nexus one to be iphone.
But as you know nexus one is using qualcomm motherboard.
But aslong cyanogen and fm transmitter is working there is no problem wiith your phone.
Click to expand...
Click to collapse
lol I seriously hope this is a joke!
I agree with JCopernicus, it should definitely work.
I installed the software in the first post but it still charges very slow compared to wall outlet
Slightly OT, but I've got a USB adapter that plugs into the wall that came with my iphone and when I plug the N1 USB cable into this to charge the N1, it still charges very slowly compared to using the proper wall adapter, why is this? Does this iphone adapter restrict the voltage or something?
Generally, "charger detected" is a circuit that has USB data pins shorted together. So when the phone's USB device probes the lines and detects them shorted, it knows it's connected to a power supply.
But since USB max current spec is 500mA, the current draw is restricted - either by the phone or by the supply.
There might be some other connectivity trick that allows the phone to know it can draw x2 current from the socket and won't damage anything. Most phones probably don't limit the current draw and count on the board to do it. Some boards don't limit the current output, or limit it higher. And the fast chargers provide pulsing voltage - which isn't like USB.
So for the board to be able to charge the device, it needs to detect a device that can use pulsing voltage, and enable such voltage on the socket. It doesn't detect Nexus as such a device, I believe, and that's why the charging is slow.
Faster charging with USB
Building on Jack_R1's response, I believe that the phone is limiting the charge rate. You can make the phone "realize" it is connected to a charger rather than a data connection by shorting the 2 middle USB pins together. I have done this in several car chargers, and the N1 About/Status shows charging (AC), which is the faster charge mode. While you can short the pins in the larger end of a dedicated USB cable, if you can disassemble the connector, I found it much easier to open the charger itself to short the pins.
i also have a gigabyte mobo that has this feature but i havent gotten around to test it out yet. I dont think it would work because the feature is software based and will only bump up the voltage if the program detects an iphone connecting to your computer. Gigabyte doesnt want to be liable if they bump up voltage on every device you plug in and fry something.
btw I have tried charging my n1 from my computer and its extremely slow. started charging at around 5pm on sunday and at 11pm it went from about 23%-97% lol.
Yes, USB charging is very slow. It's actually good for the battery, though.
Maybe someone with some know how can look at the driver files for this 3x tech and see how it checks if its an Apple device. Then fool the check and presto!
Shame I don't know how to do any of this
There is a simple hardware (don't worry, it's on the cable) mod for faster charging; however, make sure the phone has good air vent (it means NO CASE when charging).
1. modify your microUSB cable, disconnect the data connector the A (host) plug, then shorten the data connector to the B plug. (This can charge N900 properly, and speed up n1 charging).
2. modify your powered (with AC adapter plugged) USB hub. Simply shorten the #2 and 3 connectors on USB jack. Make sure you cut the copper strip going to the chip or malfunction may occur.
These modification can greatly speed up the charging, but phone will produce a lot of heat (that's why you must have the phone "naked").
I don't understand this. If the phone + battery are capable of being charged at 1000 mAh from the wall charger then why need extra cooling when asking for 1000 mAh from a PC USB socket?
Mine's still defo getting only 500 mAh from the PC USB despite it being able to give up to 2700 mAh for iPad!!! All I want is my 100 mAh charge.
Because what he suggests isn't a proper charging but rather removal of slot power control, and will damage the battery / phone, if succeeds.
Proper charging at 1000mAh requires pulsing voltage - his hack doesn't provide that. Your MB does, but it requires SW intervention to turn it on.
So can someone brew the intervention ?
martinl1030 said:
i also have a gigabyte mobo that has this feature but i havent gotten around to test it out yet. I dont think it would work because the feature is software based and will only bump up the voltage if the program detects an iphone connecting to your computer. Gigabyte doesnt want to be liable if they bump up voltage on every device you plug in and fry something.
btw I have tried charging my n1 from my computer and its extremely slow. started charging at around 5pm on sunday and at 11pm it went from about 23%-97% lol.
Click to expand...
Click to collapse
They are not doing anything to the voltage, simply allowing more current to pass.
And as said in this thread, any typical data USB cable will charge very slowly. And most standard USB ports charge well less than the max specced 500mAh, in fact my subnote at work I found charged my old phone at around 150mah one time when I was dead and needed to top off and it's all I had available.
i'm not sure of the pinout on the micro USB port but i'm pretty sure that that the Mini USB-B port that was used on phones like the G1 used shorting the -Data pin to the unused 5th pin (actually pin 4 on the connector pinout) to activate AC charge mode. some devices actually require a resister of a certain value to be placed across them to work(i know older motorola phones did like IDEN's)
one thing people often forget but should not forget is that current is drawn from the device using power. its not forced on the device. voltage is forced on a device and while a variance is usually ok for devices depending on how they were designed generally its not a good idea to exceed +1.5v on any low power DC device. 120V AC devices are designed to actually work in a much wider range like 100-130V but thats because of the power supply/nature of AC power. it always varies and in japan they use 100v 60hz AC so many electronics power supplies are designed to work in the full range to save costs and only have to make 1 unit for all (same deal with 220-240 switches on PC power supplies)
the reason why you don't want to do this mod is you could damage you PC's motherboard by pulling too much current from its circuits. USB spec is 500ma. performing this type of mod on a power adapter (car or AC) that does not get recognized as an AC charger by the phone is a safer way to go. worst case senario is you break the charger (unless you mess up on the pinout then you could damage you phone too though)
OK.
I have read the Accessories Posts, but didnt found an Solution for this.
I own an 5000mah Power Bank with USB Connectors.
Output 1A.
So, as you Guys know, if i connect such Device via USB-Data Cable it is detected by Tab as "PC-connected" and the Tab does not charge. If Tab is off, it charges quick and i am able to charge it with one Power Bank Load 1 1/2 Time.
And with my Galaxy S it works also if the Phone is on.
So my Question.
Is there any Tweak, Trick or Mod to enable the Tab to Charge it this Way?
Is it possible to modify some System settings to bring it work?
Have you checked in settings, if the battery charge doesn't go up?
It will charge using any current (even 300mA) only slower. The icon on the battery just says "I'm not connected to my proper charger", not "I'm not charging".
On JM6 and JMA the icon is also a bit better and show's it's charging but not full speed But charge rate is same as before.
TarjeiB said:
Have you checked in settings, if the battery charge doesn't go up?
Click to expand...
Click to collapse
Yes.
I am also using Battery Pro that displays me an Icon with Battery Load in Percent.
But the Tab doesnt charge.
Load of Akku decreases.
Yes. (Having JMA) the Stock Icon displays that an Power source is connected but still doesnt charge at all.
My Hope was, that anyone with Programming/Coding Skills is able to bring the Charging to work.
I am not nearly able to do this
I find it absolutely bad, that Samsung has made this incision to the usability of the Tab.
On my Galaxy S i can change with the same Power Bank in Operation without any Problems.
Very Pity that the Tab does not
pbruck said:
OK.
I have read the Accessories Posts, but didnt found an Solution for this.
I own an 5000mah Power Bank with USB Connectors.
Output 1A.
So, as you Guys know, if i connect such Device via USB-Data Cable it is detected by Tab as "PC-connected" and the Tab does not charge. If Tab is off, it charges quick and i am able to charge it with one Power Bank Load 1 1/2 Time.
And with my Galaxy S it works also if the Phone is on.
So my Question.
Is there any Tweak, Trick or Mod to enable the Tab to Charge it this Way?
Is it possible to modify some System settings to bring it work?
Click to expand...
Click to collapse
Hi Pbruck, which power pack are you using & what's the specification for it. can you provide me with the model no.? Thank you.
Hi,
i use this:
http://www.pearl.de/a-PX5398-5542.shtml
Sorry, but have only found it in this German Shop.
Maybe you can still use the provided Informations there.
Babelfish Translation:
http://de.babelfish.yahoo.com/trans...X5398-5542.shtml&lp=de_en&btnTrUrl=Übersetzen
It says "1A (2x usb)" so you need to use 2 ports to get to the 1A.
There is no programming or modding necessary, the tab charges from anything that is powerfull enough and your crappy cheap charger is not (im just teasing you cause i ordered things from pearl before and all they sell is junk).
Hi all, just came 3 days ago from an htc hd2, and so far I am more than happy with it.
I have only one complaint and maybe you guys will help me sharing your experience : I can't charge this phone in my car while using gps.
It seems that the power adapter is not powerful enough to charge the phone screen on.
The car charger has a 5v 1000ma output, more than the regular wall charger provided by Samsung and it was working well before with my HD2 so I have no clue about this problem.
Did you experience that issue too, else can you share what car charger do you use?
try to buy new standard car charger with micro plug.. 13 eur and you will be saved..
Sent from my GT-I9100 using XDA App
Charger doesn't matter unless the phone is dropping into USB charging mode - phone limits to around 600-650 mA by default.
Custom kernels can bump this limit up for I9100 users. I777 users are screwed - we've got a crippled charger chip.
I had the same problem, I used the samsung one, useless, so I used my iPad charger, which is 2A, and charges the iPad quick, still useless. We drove from Bathurst NSW, down to Melbourne, about 10 hour drive, plugged in all the way using GPS, and about an hour from home, the connect to charger warning came on!! So once I stopped GPS, it started taking charge. Looks like when the phone is in use, it draws more then it takes charge, plus I read somewhere on here the phone is limited on the charge it takes, so using the 2A does nothing different then the stock 500mA charger.
I always had this problem with my Nexus One, although they are different phones, the problem is the same, uses more power then it can recharge in USB mode.
After trying 3 or 4 different charges I remember that I found one ultra-cheap 'made in taiwan' from a street seller that worked very well.... so it's kind of a lucky shot!
good luck!
Im using a genuine Samsung SGS2 charger and I can charge and run Sygic just fine. I started my journey with 80% and 40mins later I was up to 91% when I stopped and got out. (not in aeroplane mode..)
Very interesting feedbacks... So that confirm that is clearly not a matter of output amperage power.
It is now the same problem on the galaxy tab 10.1, for quickly charge this tab you need the Samsung compatible usb adapter.
It can be likely with a tab bringing a proprietary plug, but I didn't thought it will be the same with a Samsung phone bringing a regular micro usb plug. Quite frustrating and disappointing!
I will search around a micro plug car charger as suggested by redzion, but actually I don't clearly see the difference with my usb charger + a micro usb cable.
Double post, sorry.
If I use the usb cable from my cd player I have the same problem but if I use the official Samsung car charger Ithe only problem I have is the phone getting stupid hot
Sent from my GT-I9100 using xda premium
Oh Samsung, when you will understand?!
Samsung DOES follow the USB charging standard - it goes to its highest current setting when a charger that follows the standard is connected.
Note that iPad/iPhone chargers do NOT follow the standard - Samsungs will treat these as USB hosts and limit to 450 mA instead of 600-650.
Modified kernels can increase both of these values on I9100s.
The only thing Samsung really did **** up is counting screen/CPU current usage against the charge current limits - that's just stupid.
So the charger has smarts. On the i9000 factory chargers, the data pins were bridged. Bridging these pins manually on a USB cable when connecting to a USB source (such as a PC) enabled full current charging. You can see this in Settings -> About; it will say either USB or AC charging.
Do you think this is the case with the i9100?
I don't condone testing this theory on your i9100. Increasing the max current via custom ROM may be a safer solution.
I had the same problem. Two things fixed it for me:
1) I bought this charger: Sony Ericsson AN300 Micro USB 10€
2) I am using a custom kernel now
Any charger that is rated at 1000mA or more (per port) will do just fine. The problem is the cable - you need a quality microUSB cable, or it won't provide all the juice you need. I had the same issue, and I swapped three chargers until I found the real culprit.
Try with the charger you have now and the mUSB cable that was in the phone box - it should work well with that one.
I just press the power button to turn the screen off. when i need the sat nav i press the power and it still tracks you so there is no delay. With the screen off it does charge.
same problem
Duffman19 said:
I just press the power button to turn the screen off. when i need the sat nav i press the power and it still tracks you so there is no delay. With the screen off it does charge.
Click to expand...
Click to collapse
You are right, but even if it is better than nothing the charging time is still a big problem.
Yesterday I drove for at least 40mn phone off. Arrived to destination, I turn the device on: it charged only from 0 to 5%
I would like to test the mariusi theory concerning the Samsung micro usb cable, unfortunately on my SgsII box I just have a wall charger, no a microusb-usb cable.
Entropy512 said:
Samsung DOES follow the USB charging standard - it goes to its highest current setting when a charger that follows the standard is connected.
Click to expand...
Click to collapse
Is there a way to know before buying if the charger respect this charging standard?
I have some cheap usb chargers here and no one is a fast as the one provided by Samsung.
Entropy512 said:
The only thing Samsung really did **** up is counting screen/CPU current usage against the charge current limits - that's just stupid.
Click to expand...
Click to collapse
Maybe for safety purpose? Gps phones can become very hot behind the car glass.
Samsung are trying to "encourage" you to buy only their official accessories. To do this they've wired something differently in their chargers and cables. This "problem" exists on the Galaxy Tab too and can be solved with this adapter...
http://www.ebay.co.uk/itm/USB-car-w...ccessories&hash=item2c5c07736b#ht_3084wt_1163
It's cheap and turns a trickle charge into a full charge. I don't know the specifics of what they've done, but their USB charging just isn't the same as most others manufacturers.
Archer said:
It's cheap and turns a trickle charge into a full charge. I don't know the specifics of what they've done, but their USB charging just isn't the same as most others manufacturers.
Click to expand...
Click to collapse
Great find.
Pretty sure it just bridges the data pins.
I have TPT for 10 days now.
I have usual iisue with USB charging. When used like standard smartphone = put it to charger overnight. Not usable anyway. Charge rate about 5% per hour, which means 20 hours per full charge???
I even consulted it with local technical support. I was adviced to buy docking station with external power adapter .....
So ... I took regulated power supply, made a USB socket connected to it and started to measure
.. and look what I found
When device is switched on, usb power oscilates sligthly under 1000 mA. It is NOT using all available power of 2 Amps of stock power adapter!!!!!
But ... when I power the device off using power button. The current goes down to 300mA for about 5seconds and then raises to full 2 A!
Conclusion? It seems like control issue of the charging ciurcits. What if we can enable full 2A power even when turned on? SW issue?
Is there any chance, how to instruct internal power circuity to use all available power? ADB?
Well I guess that explains the slow charging that people have been reporting. I picked up a dock for my tablet from amazon for about $30 shipped. Now I just put my USB charger in my bag for when I am out and about and dock it when I get home. That being said when I was charging via USB before I had the dock, a full charge seemed to take about 6 hours or so.
As for your question regarding modifying the input charging rate while powered on, I am not sure that can be done via ADB. I am taking a stab in the dark here, but I wouldn't be surprised if the charging rate was hard coded into the power circuit. Which would make some sense so as not to draw to much power if someone wanted to try and charge their tablet while having it plugged into a laptop or USB hub. I am not sure if it has an auto sense capability to determine whether or not it is charging via USB from a port or from the power adapter. I do know when I hook it up to my computer to transfer files it offers me the option to charge via USB, but I think that is a software thing and not hardware. I could be wrong. Maybe if we had access to the board schematics I could figure out. I can read schematics and might be able to figure it out.
Any chance you could get a proper reading via the docking port on the tablet? I would be curious to see if it is always at 2A. I haven't counted the pins but I don't see why you would need more than VCC+, VCC-, GND and maybe a sense line. But I know there are more than 4 pins.
Sent from my ThinkPad Tablet using xda premium
I would say this is a SW issue. Maybe if we had the kernel source code someone could cook up a custom kernel with that control feature tweeked.
Temetka said:
~
Any chance you could get a proper reading via the docking port on the tablet? I would be curious to see if it is always at 2A. I haven't counted the pins but I don't see why you would need more than VCC+, VCC-, GND and maybe a sense line. But I know there are more than 4 pins.
~
Click to expand...
Click to collapse
The best thing to use is a watt meter if anyone wants to pursue this.
My findings indicated that the dock has a similar issue as the USB charger when the TPT is on.
Maximum current allowed at the dock connector was measured at just over 1A . Dock should charge the battery at a maximum rate of just over 1% per minute provided the battery charge level is below 70%. So if you discharge the battery to around 50% and compare charge rates you should see the difference between TPT on/off.
I figured I would share this since I have not found another thread with this info.
The Galaxy Note 10.1 will charge from usb.
I find this interesting because no tablet, at least none I have known, will do this. They all need to be actually plugged into a wall outlet to charge. However, my note 10.1 has charged from around 13% to 32% plugged into USB. Now, mind you , it doesnt charge very fast, but it does charge.
For some this won't matter. In my case, that 3 ft cord doesnt go from the floor outlet to my desk at work too easily, but the usb will plug in very easily and reach where I need it too. At the very least, it will add a little more time to the length of the batter. I work a 10 hour shift, not adding in the hour for lunch, and I can usually made it about 8 hours. So this may get me the extra two hours I need...hopefully.
phoenixbennu said:
I figured I would share this since I have not found another thread with this info.
The Galaxy Note 10.1 will charge from usb.
I find this interesting because no tablet, at least none I have known, will do this. They all need to be actually plugged into a wall outlet to charge. However, my note 10.1 has charged from around 13% to 32% plugged into USB. Now, mind you , it doesnt charge very fast, but it does charge.
For some this won't matter. In my case, that 3 ft cord doesnt go from the floor outlet to my desk at work too easily, but the usb will plug in very easily and reach where I need it too. At the very least, it will add a little more time to the length of the batter. I work a 10 hour shift, not adding in the hour for lunch, and I can usually made it about 8 hours. So this may get me the extra two hours I need...hopefully.
Click to expand...
Click to collapse
Hmm, I think mine claims not to (it puts an X on the battery icon), but I didn't leave it plugged into my computer long enough to see whether it charged or not. I think all tablets can potentially charge via USB port on a PC, it's just that most disable it out of the box but eg. for the Galaxy Tab 10.1 custom kernels could enable charging over USB.
iofthestorm said:
Hmm, I think mine claims not to (it puts an X on the battery icon), but I didn't leave it plugged into my computer long enough to see whether it charged or not. I think all tablets can potentially charge via USB port on a PC, it's just that most disable it out of the box but eg. for the Galaxy Tab 10.1 custom kernels could enable charging over USB.
Click to expand...
Click to collapse
Mine also puts the RED X over the battery icon whether I try to charge it through a PC USB port or other USB charging port other than the Samsung adapter (Goal Zero 150 usb port and Panatech 10000mah external USB battery pack). The tablet shows that it is charging when i view it using GO POWER MASTER app. Watched it for 5 minutes but with WIFI off, it still dropped from 88% to 87%. I am however using the stock kernel.
It charges faster if you have the screen off. The usb gives more or less what you need to keep it running with the screen on.
Skickat från min GT-I9300 via Tapatalk 2
Mine put the red X on the battery icon as well, but still charged. I had to have the screen off.
I had mind plugged into my USB 3.0 port (which should really make a difference) to transfer some files, and then just left it plugged in and it charges. Its definitely a trickle charge, but I am glad to see it does this, as my a500 did not.
When I transferred 40Gb of data to the mSD via MTP (screen off) and called up the batt-graph after disconnection it showed me a fair charging rate. Not stunning but at least a noticeable charge ( from 63% to 82% in three hours).
So it does charge the battery, in spite of the red X?
Yes it does, albeit very slowly.
You guys are misinterpreting the red x. Just got off the phone with Samsung. The x stands for "extra awesome charging". I swear.
Sent from my GT-N8013 using Tapatalk 2
phoenixbennu said:
I figured I would share this since I have not found another thread with this info.
The Galaxy Note 10.1 will charge from usb.
I find this interesting because no tablet, at least none I have known, will do this. They all need to be actually plugged into a wall outlet to charge. However, my note 10.1 has charged from around 13% to 32% plugged into USB. Now, mind you , it doesnt charge very fast, but it does charge.
For some this won't matter. In my case, that 3 ft cord doesnt go from the floor outlet to my desk at work too easily, but the usb will plug in very easily and reach where I need it too. At the very least, it will add a little more time to the length of the batter. I work a 10 hour shift, not adding in the hour for lunch, and I can usually made it about 8 hours. So this may get me the extra two hours I need...hopefully.
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Interesting, because every tablet I've owned (Tab 10.1 and Nexus 7) behaved like this.
They will charge VERY slowly on USB - and will likely not charge at all if the screen is on due to the total unit power consumption being >500 mA.
Entropy512 said:
Interesting, because every tablet I've owned (Tab 10.1 and Nexus 7) behaved like this.
They will charge VERY slowly on USB - and will likely not charge at all if the screen is on due to the total unit power consumption being >500 mA.
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Same here. iPads, nook color, Samsung tablets, all say not charging but do trickle charge if you are doing anything to drain it faster than thenusb can supply. It takes around 8 to 10 hours to charge my gt101 through regular USB 2.0.
mitchellvii said:
You guys are misinterpreting the red x. Just got off the phone with Samsung. The x stands for "extra awesome charging". I swear.
Sent from my GT-N8013 using Tapatalk 2
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Bwahahaha... A friend of mine posted on twitter that Apple should make something that lets iDevices charge each other... Ours actually can because of USB host! I actually lost the usb host adapter for my old galaxy tab so I need to get a new one but I had one for my gs3, and it does charge my tablet. But the reverse is clearly more useful.
Sent from my SCH-I535 using Tapatalk 2
Tested again when attached to Notebook by USB:
Screen on at max. Brightness and working: batt charge stays level
Screen off: batt charges approx. 5% per hour
Tested on GNote charger (1A output)
Screen on : charging very slowly (approx. 3% per hour)
Screen off: charging approx. 8% per hour
Tested on iPad charger:
Slower than original charger although max. Output:
The more items you have attacht to your computers USB the less power it has to allow your tablet to draw for charging.
donec said:
The more items you have attacht to your computers USB the less power it has to allow your tablet to draw for charging.
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I don't think this is the case. The USB ports provide a set power output, and not variable by available power supply type of output.
phoenixbennu said:
I don't think this is the case. The USB ports provide a set power output, and not variable by available power supply type of output.
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You are correct they are not variable but they only have a given amount ofpwer available and if you are drawing the max and add another device that needs more power to charge the power will not be available.
donec said:
You are correct they are not variable but they only have a given amount ofpwer available and if you are drawing the max and add another device that needs more power to charge the power will not be available.
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Of course, everything has a limited power availability, USB ports being no exception, whether having their own psu or bus powered or whatever your setup may be, but unless you are doing something beyond practical use or have a poorly designed setup, than this should not be a problem. I know some systems out there, the mac book pro for example, specific limits USB power output between ports by design (you may even call it variable haha...but by design). However, in a general sense, you should not have a power output issue with simply plugging in for usb charging., even if all other ports are used up as well. So don't daisy chain, or do anything like that. Practical use should be fine. I personally hook my usb charged devices, like my phone, to my monitor at work. It was a few usb ports on the side, and it works great. Also, it keeps me from having to deal with all the annoying security popups that go with plugging it into the actual computer.
In a probably unfunny but still remotely amusing anecdote, I remember the massive work I put my a500 through. I used to have a usb hub attached with 2 1tb portable hard drives, a keyboard, a mouse, my phones, and more all charging directly from USB. Never had trouble with power issues, aside from quicker draining of the battery. lol.
does anyone know if charging is possible when you use an Y adapter on USB-OTG to hook up an external harddrive and a charger at the same time?
cproaudio said:
does anyone know if charging is possible when you use an Y adapter on USB-OTG to hook up an external harddrive and a charger at the same time?
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Barring any specific device hardware limitations, it is possible to do data transfer and power transfer at the same time using a y cable. Its essentially the same thing as using a usb hub, except you only have two ports instead of 4 or more.
As for actual practical use on the note, I have not tried it out, and I am not aware of any limitations built into software or hardware to prevent it. So, I do not see you having a problem with it.
Almost all tablets can charge through regular USB2 if they're sleeping (or better - powered off).
USB has power limits (USB1.1 is 100mA, USB2.0 is 500mA and USB3 is 2A) BUT these are the 'minimum maximums', if you will. That is, these are the current source *required* for certification. It's entirely permissable for a USB port to provide as much current as it wants - it just can't be limited to *less* than these amounts.
USB 2.0 and later ports are also supposed to implement 'overcurrent' warnings if the device is taking more current than the port can provide..
That's why, for example, some ports can drive a CDROM or external HD drive without a problem - while other ones can't.
The Note 10.1 needs a little over 2A @ 5V to charge at a reasonable rate.
One other note, if you let your battery drain very low, then the lower current of most USB 2 ports won't be enough to charge it even if it's off. The charge current curve isn't linear.