I'm trying to track down some wlan_rx_wake issue.
My understanding is that what is supposed to happen is that multicast is normally enabled when a device is awake, or perhaps with the screen on, but when the screen blanks, or more likely the system suspends, the broadcom chip is set to ignore multicast
This allows the device to sleep peacefully without being woken up by local lan broadcast traffic.
Does anyone know if the stock samsung 4.3 kernel (J9/VIA) does this?
How about alternative kernels/roms - do any explicitly enable or disable this?
It may also be an app that has the multicast lock... but I've disabled all apps I can with this permission leaving just stock samsung apps that can't be disabled. I can't root as I need sky go. I'm reluctant to replace with non standard rom due to knox, but will consider it (I've replaced firmware many times on other devices inc. s3)
The reason I ask is on my local lan I was seeing my S4 (and note 10.1) have this wakelock active for far too long. I've now removed most broadcasts from the network (most were netbios related!) and this wakelock is well under control now (6 minutes out of 1:16 isn't bad). However I have the same issue in the office where I can't fix the lan....
One way or the other I have a suspicion this is an oversigh in samsung's 4.3 rom.
I should say broadcast more generally....
So far the only mentions I can find are
- This modified 4.3 google edition kernel http://forum.xda-developers.com/showthread.php?t=2342298&highlight=multicast+suspend
More battery life tests and use of Better battery stats etc, along with network traces rather convinces me this is an increasing problem. At home I have some control over my network. at a place of work, less so.
Public wifi access points are usually ok as inter-device broadcasts are blocked. But home with uPNP, lots of devices doing arp requests etc is nearly impossible to manage - though I did cut mine down by about half. I'm looking at whether ddwrt could help with some filtering in a seperate wireless AP just for the phone/tablet!
The only real fix is for the device to implement filtering, which from the kernel source it looks as if it might but the only way to try for sure is either to root (breaking sky go) or do a custom rom (breaking KNOX, and possibly sky go). I wish I knew if there's some app/config causing my broadcast filter not to be active, or if it's a samsung kernel build choice.
I've continued to see this across my S4 (4.3) and Note 10.1 (4.1) running official samsung roms. It's been frustrating as it equates to sigificant power drain.
My sons' nexus 5 / 10 does not show this issue.
A few days ago I decided to flash a port of OmniROM 4.4.2 onto my note 10.1 . Same network, same apps - the problem has basically gone. There is still some wifi wake time but nothing like the amount previously.
My guess is the omnirom/aosp kernel is correctly filtering broadcasts, or just maybe it's because it's missing some samsung bloatware.
Possible fixes on the S4 are more awkward
- Any rooting, flashing a non-official rom etc will result in a KNOX 0x1 flag. Not really an issue to me, but annoying
- Whilst I *love* Omnirom on the tablet it may not be stable enough for phone use yet
- The samsung S4 camera is very good. Much better than alternatives
My current thought therefore is to
- hold out for samsung s4 build to see if the issue is addressed
- If not try rooting and disabling all samsung bloat, and try alternative kernels (if any) on the TW rom
- if all else fails consider OmniRom or CM11 , or Samsung's GE rom (by this point KNOX will be tripped anyway)
ANy thoughts?
Anyone else seeing this issue?
Any kernel devs care to comment?
So another check. Phone sat idle for an hour, of which 47 minutes was awake.
Apps did account for around 13 minutes of this - the big proportion being skype which I just installed earlier today. What a surprise. That's getting deinstalled (again), but most of the rest was just wlan_rx_wake ie the device being woken up to deal with packets. If asleep that should be minimal, as it is when running 4.4 on the tablet, yet it isn't - clearly samsung are not implementing the broadcast/multicast filter on sleep. AARGGH
I'm slightly bemused I see so few people mentioning this. Is it that they don't look? Don't care? Or is it just me......
I'd be tempted to do a complete reinstall... it would be a lot easier if I could easily backup (titanium backup or CWM backup) yet do either and I trickt the KNOX switch. thanks Samsung. Not. It's not a big deal as everthing is cloudified, but it would cost me a few hours getting things setup again, even things like the desktop layout ...
So is anyone using an S4 on 4.3 and NOT seeing this issue when on wifi (with multiple devices around) ? If so, just perhaps I'll try a factory reset, but I already did that coming from 4.2 anyway. Or perhaps you are using a custom rom/kernel and not seeing this or noticed it improved?
See also http://forum.xda-developers.com/showthread.php?t=2133176&page=3
Still on stock rom, and still puzzling this.
Most samsung value add that can be disabled in a stock, unrooted rom, is.
Yet a wireless network packet trace (run on an attached PC) shows a significant amount of activity - not being *received* by the phone, but actually being sent
Packets like this show up around every second! Hardly surprising the device is kept awake a lot
24631 888.950873000 android-295fdb686877cc14.home 239.255.255.250 SSDP 167 M-SEARCH * HTTP/1.1
M-SEARCH * HTTP/1.1
HOST: 239.255.255.250:1900
MAN: "ssdp:discover"
MX: 1
ST: urn:dial-multiscreen-org:service:dial:1
In fact in 10 minutes idle this was pretty much the only traffic to or from the phone!
This looks very chromecast-ish -- which I don't have. presumably it's something screen share related from samsung -- even though no devices are connected/setup to cast screen
This must also be from a non-disable-able app - but I'm unsure how to categorically pin it down without root access
I've actually been here before on my note 10.1 - where my resolution was to switch to omnirom. That's less easy on the S4 due to knox concerns, and camera & other more esoteric features (spen is fine with omnirom on the note 10.1!)
Went through trying to kill processes/tasks that I could (I'm not root) and nothing stopped these SSDP broadcasts.
Checked settings - no changes made any difference.
Played with adb shell, dumpsys, logcat & finally ddms - but no jobs.
Wish I could find out the process that is initiating these packets!
An update.......
I decided to try one more time with the stock 4.3 BTU rom and did a full factory reset
WIth no google or samsung account, and no apps I had no wlan_rx_lock
I then configured google accounts (inc. gmail etc) with sync and added only minimal apps (zedge, chrome, mysms, kii keyboard)
still no wakelock issue
This would suggest it's app related, though by not configuring my samsung account (I don't need to) that could affect the way the bloatware works too.
Quite happy now! Wish I could take a "snapshot" backup. Of course that would need a custom recovery and break the KNOX flag. Oh samsung. that's annoying.
The plan is to leave it like this until after work, then to add tweetings & spotify. I'm going to slowly add apps back so hopefully help in identifying when (if at all) the problem reduces. Of course there could be a latent affect which would just be painful.
Annoying too I wasn't able to find the cause with adb, better battery stats, dumpsys etc without doing it the basic way.
planetf1 said:
An update.......
I decided to try one more time with the stock 4.3 BTU rom and did a full factory reset
WIth no google or samsung account, and no apps I had no wlan_rx_lock
I then configured google accounts (inc. gmail etc) with sync and added only minimal apps (zedge, chrome, mysms, kii keyboard)
still no wakelock issue
This would suggest it's app related, though by not configuring my samsung account (I don't need to) that could affect the way the bloatware works too.
Quite happy now! Wish I could take a "snapshot" backup. Of course that would need a custom recovery and break the KNOX flag. Oh samsung. that's annoying.
The plan is to leave it like this until after work, then to add tweetings & spotify. I'm going to slowly add apps back so hopefully help in identifying when (if at all) the problem reduces. Of course there could be a latent affect which would just be painful.
Annoying too I wasn't able to find the cause with adb, better battery stats, dumpsys etc without doing it the basic way.
Click to expand...
Click to collapse
Awe I was reading your monologue breathlessly while hoping for a solution. I've been at work 8 hours, and I have 4h 43m of awake time. All of it minus 10 mins was due wlan_wake
I'm on omega with ktoonz
Hello,
Please help to solve the following situation:
after activating Ultra Power Saving Mode on encrypted Samsung Galaxy A300FU and rebooting devise - message "Sysem UI has stopped" appear.
And now only black screen is visible with no Ultra Saving Mode menu or else-what.
Question: how to disable UPSM in this situation?
Thank you all for replies.
Best Regards
I have no clue. The SysUI.apk just force closed which means your system is still active, but the UI will not be.
Wil rebooting the phone put it out of power saving mode?
Had to do a hard reset on the Samsung A3 today to get rid of this childish UI stop working issue, caused most probably by our local ICTs.
A3 is nice devise though. But after spending half day on solving this unnecessary unexpected error - I am back to my old and reliable iPhone 5s.
Neovit78 said:
Had to do a hard reset on the Samsung A3 today to get rid of this childish UI stop working issue, caused most probably by our local ICTs.
A3 is nice devise though. But after spending half day on solving this unnecessary unexpected error - I am back to my old and reliable iPhone 5s.
Click to expand...
Click to collapse
I would totally give the A3 another try. It's a decent phone. But it's mid-end. iPhone 5S is high-end so there are differences. I switched from iPhone 6 to the A5 and I don't have the slightest regret
Anyone here who updated from android 5.0 to android 6.0? Is everything ok? After update is there any issue? Anyway fellas, I am a new samsung user, that's why asking. Another question is, When i update android 6.0, do i need to remove Micro SD card before update?
I did it over OTA - this way doesn't require you to do anything special (no factory reset, or card removal). It is a good idea to back your phone up before the process. I synced it to the cloud and did a backup of apps+data in Helium.
Looks better - provides more security in app manager - something that would be avaialble after root. Otherwise its very similar to previous one. Did not notice any issues so far.
Phone gets very warm (not hot) during the update process - don't get scared!
How does it look via Odin? - read one of the manuals, as it's always the same procedure.
it's mostly fine
there was one service error related to watch/health at cold boot, but you can fix that by disabling the component (I forgot the exact error but you can google it if you get it)
one thing bugs me is that wifi goes down when the device goes to sleep, and theres no way to force enable it (its turned to never sleep already, and I put some services into not conserve battery mode)
Fast charging not indicating
Guys, I'm using a samsung galaxy A5 2016 (A510F)
Marshmallow(6.0.1) is running on the phone.
When it charges using the original charger (adaptive fast charging) the fast charging notification is not indicates on the notification panel("Fast charging" notification, Battery icon of charging is indicating). But my phone still charges fast. Just I want to know is there a problem with my phone because its not notify me the fast charging notification????
Or is there not a notification for the fast charging in Samsung galaxy A5 2016 Android Marshmallow(6.0.1)
Please help me ??
As you can see by the title, my S8 has been running very slowly recently. This problem has come up recently. Cleaning the memory through the settings only seems to be a temporary fix, and I would rather not root because I don't want to trip Knox. Is there any good apps or methods I can use to really get a good cleaning on my phone and speed it up?
Uninstall apps you don't use, use the device maintenance app built into the phone, clear cache and dalvik in recovery. That's pretty much all I can say without knowing exactly what you mean when you say "my phone is running slowly"
my att galaxy s7 edge is running very slow from past few weeks, I tries to uninstall all new app but with no luck, is there way to figure out what is causing phone slowness.
Thanks
Prashant
It's a Samsung device. It's part of the experience...
However, you can boot into recovery and clear the cache, which often restores normal performance. When you get back into the OS, you can finish by using Device Maintenance to flush the remaining caches. I try to make sure to do that at least twice a month or as needed.
Other than that, check the apps on your phone. Some apps are known to cause devices to slow down. I disabled Facebook, for example, and noticed an immediate improvement.
It just feels like the same issue as iphone has - where apple deliberately slowing down the system to preserve longer dying battery...