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[Q] 802.11AC and 5GHz Issue

I've researched for any past issues on this topic but couldn't find anything similar.
I live in London and use Asus AC68U, I have connected my Note 4 (N910C) and Tab S fine on both 2.4GHz and 5GHz, but never checked whether this is connected on N or AC. The Channel setting on the router is left on Auto, and I've labaled the 5GHz SSID to have a "5G" at the end (eg. 2.4GHz SSID: "My WiFi" ; 5GHz SSID: "My WiFi 5G")
Then flew to Indonesia bringing along the AC68U, reset and reconfigured the Router to be used there, I have also configured an N66U as an Access Point (not repeater). Now my Note 4 cant' even see 5GHz anymore, even though wireless configuration is exactly the same as in London (except the WiFi SSID and password). I then found out a way to know which 802.11 speed my phone is connected to (by doing the #*0011# thing), and turned out it's on 802.11N 2.4Ghz.
I then went to the N66U (out of Radio range of the AC68U) and I still cannot see the 5GHz SSID. So I took out my Tab S 8.4, switched WiFi on, lo behold, 5Ghz is visible and able to connect to both router seamlessly. Checking the connection type, the Tab S is on 802.11AC Ch. 36 Frequency 5180Mhz, WiFi Power Save Mode On, link speed 866Mbps, to the AC68U.
My Dad has a Galaxy S5, it also cannot see the 5GHz SSID, but is at least connected to the 2.4GHz 802.11AC.
I have changed channels manually on the router but still can't see 5GHz from the Note 4, also switched OFF the WiFi Power Save Mode.
So the question is.... does my Note 4 N910C even have AC? And what is going on with my 5GHz band? Has anyone seen this problem before or point me to a thread you've been to?

I've got the n910c and connects in ac on 5ghz fine. I have a netgear r7000 running ddwrt. Has it ever worked for you ?

manook said:
I've got the n910c and connects in ac on 5ghz fine. I have a netgear r7000 running ddwrt. Has it ever worked for you ?
Click to expand...
Click to collapse
I also have the 910F and a Netgear R6300 with DD-WRT.
It took some configuring. But i expect this has something to do with the preset ups for using your router in Indonesia.
itll probably;y work when you get back to wherever you live.

Thanks for the replies.
manook said:
I've got the n910c and connects in ac on 5ghz fine. I have a netgear r7000 running ddwrt. Has it ever worked for you ?
Click to expand...
Click to collapse
5Ghz has worked for me in London using the same Asus router that I used in London, but I'm not sure if my Note 4 ever connected as AC.
fkofilee said:
I also have the 910F and a Netgear R6300 with DD-WRT.
It took some configuring. But i expect this has something to do with the preset ups for using your router in Indonesia.
itll probably;y work when you get back to wherever you live.
Click to expand...
Click to collapse
Well, I brought the AC68U I used in London to Indonesia, the phone was connected on 5GHz on this router when it was in London, but somehow it can't even see the 5GHz SSID now in Indonesia.
I think I need to reset the modem and WiFi module somehow, been searching the web on how to do that but haven't found it yet.
Other devices that are currently able to connect to 5GHz and/or AC:
Galaxy Tab S: Can connect to 2.4GHz + 5GHz on AC
Galaxy S5: Can connect to 2.4GHz AC (Cannot see 5GHz AC)
Laptops: Can connect to 2.4GHz + 5GHZ N
Added Info: Tried WiFi Analyzer, Note 4 still cannot see 5GHz signal while the Tab S can.

Did you put in a local SIM? The phones may be respecting local regulations regarding frequency usage that the other devices don't, as they don't have a SIM giving them locale. I'd be curious what would happen if you put in your London SIM.

rcobourn said:
Did you put in a local SIM? The phones may be respecting local regulations regarding frequency usage that the other devices don't, as they don't have a SIM giving them locale. I'd be curious what would happen if you put in your London SIM.
Click to expand...
Click to collapse
Yeah I'm using local SIM, but when I arrived still with my Voda UK SIM in the phone, the existing N66U Router (before I turned it into Access Point) was transmitting both 2.4GHz and 5GHz, my Note 4 couldn't see it. I thought I had switched off 5G SSID but when I checked, it was ON. Very sure something is up with this Note 4.
I removed the SIM card and inserted it to my LTE Tab S, switched it on, switched WiFi on, connected to 5G just fine.
I'm gonna try re-flashing the same stock ROM. This phone and the Tab are all Non-Rooted btw.

Solution: Don't set the frequency to "Auto". Manually choose the frequency for 5 Ghz, preferably to something low such as channel 36. This worked for me. I haven't tried with any other frequency though. Someone mentioned online that it might be due to Android phones not supporting DFS frequencies.
Good luck.

manook said:
I've got the n910c and connects in ac on 5ghz fine. I have a netgear r7000 running ddwrt. Has it ever worked for you ?
Click to expand...
Click to collapse
I just installed dd-wrt on my netgear r7000 and my n910h stopped seeing the 5Ghz band after that.
With r7000 stock firmware everything is fine.
Could you please tell me what's your dd-wrt settings for the 5Ghz band?

[Q] Lollipop 5ghz wifi

Hi all,
Is anyone having problems connecting to 5ghz bands on their N4?
I reconnected a simultaneous dual-band router that I used while my N4 was on KitKat. It would connect on the 5ghz band without issues, and I could view the 5ghz bands on inSSIDer. I installed the Lollipop factory image and now I cannot view or connect to my router over 5ghz, only 2.4ghz. Setting a different SSID, changing channels and widths does not help.

Idontwantausername said:
Hi all,
Is anyone having problems connecting to 5ghz bands on their N4?
I reconnected a simultaneous dual-band router that I used while my N4 was on KitKat. It would connect on the 5ghz band without issues, and I could view the 5ghz bands on inSSIDer. I installed the Lollipop factory image and now I cannot view or connect to my router over 5ghz, only 2.4ghz. Setting a different SSID, changing channels and widths does not help.
Click to expand...
Click to collapse
I'm having the same issue. It doesn't detect any 5 ghz wifi even if I set it to 5 ghz wifi only. I've flashed the factory image a second time thinking that might fix it but it doesn't.

I'm at work now where we have multiple 5ghz networks, and I can't see any of them. Any ideas on what I can do about this? Report a bug somewhere?

I have the the same problem. I've tried high number and low number channels on my Nighthawk using factory firmware default settings.

I solved the issue by reverting to kitkat 4.4.4. I think Google still has some work to do on 5.0.

i've the same problem.... i also thought to revert to KK but dont have the time for it....
i just wish google will fix the 5GHz issue and i wish for black theme (hate this bright white)
Sent from my Nexus 4

i think, the SSID name is the problem?! i'm at work and we have also multiple 5ghz SSIDs. SSIDs without any special character will be shown.
but i have one more problem with wifi. sometimes the phone can't reactivate the wifi module after i used bluetooth in the car. only restart helps

Yeah, I've been having the same issue since upgrading to lollipop.
I remember those issues with one of the older versions of android, but on 4.4.4 all was fine, I could see the networks and connect to them.
Now I no longer see any of the 5Ghz networks.

swallowingled said:
I'm having the same issue. It doesn't detect any 5 ghz wifi even if I set it to 5 ghz wifi only. I've flashed the factory image a second time thinking that might fix it but it doesn't.
Click to expand...
Click to collapse
My nexus 4 (with Lollipop) behaves a bit differently. It does see 5GHz networks when set to 5GHz only, but doesn't see them in automatic mode.

all 5GHz wifi will disappear sometime

Hi there,
i found that all 5GHz wifi will disappear sometime and only 2.4GHz wifi were left even the signal is very good.
Not only mine but also my neighbor's 5GHz wifi was gone too so i can confirm that there is no problem with my router.
but it can be solved by restarting WIFI in setting menu.
is that a hardware bug or software bug? have anyone facing this problem too? :crying:
ps: using stock rom 4.5.5 & stock kernel

I've too, but disappear and restore itself.
Sent from ONEPLUS A5000 by Tapatalk

I have the exact same issue, I have 2 separate routers, one upstairs and one downstairs. The one upstairs is a 2.4ghz router and the one downstairs a dual-band router with separate SSID's for the bands, sometimes when I come downstairs I can only see the 2.4ghz SSID not the 5ghz one.

B0unze said:
I have the exact same issue, I have 2 separate routers, one upstairs and one downstairs. The one upstairs is a 2.4ghz router and the one downstairs a dual-band router with separate SSID's for the bands, sometimes when I come downstairs I can only see the 2.4ghz SSID not the 5ghz one.
Click to expand...
Click to collapse
but the 5ghz one shown when u restart wifi, right?

Have you guys already contacted OnePlus about this? I have a few days ago, and I'm currently still in touch with them to find out why this happens.
I for example have the problem, that sometimes the data throughput using 5 GHz networks is absolutely zero, no data is transferred at all (tested with iperf3) and then sometimes it resumes but other times I have to disable WiFi entirely (disable background scan to do that) and reconnect and only then it would start communicating again.
BTW: I'll include a link to this thread on my ticket with them, so that they can see I'm not alone with WiFi issues on the 5 GHz band.

kimyeungg said:
but the 5ghz one shown when u restart wifi, right?
Click to expand...
Click to collapse
yes but it's still quite annoying.

makuser said:
Have you guys already contacted OnePlus about this? I have a few days ago, and I'm currently still in touch with them to find out why this happens.
I for example have the problem, that sometimes the data throughput using 5 GHz networks is absolutely zero, no data is transferred at all (tested with iperf3) and then sometimes it resumes but other times I have to disable WiFi entirely (disable background scan to do that) and reconnect and only then it would start communicating again.
BTW: I'll include a link to this thread on my ticket with them, so that they can see I'm not alone with WiFi issues on the 5 GHz band.
Click to expand...
Click to collapse
i didn't contact oneplus about this issue but glad to know you are trying to do this
B0unze said:
yes but it's still quite annoying.
Click to expand...
Click to collapse
same here :crying:
when you guys' phone were made?
mine is 17.06.13, don't know if it is relevant.

WiFi 5 GHz doesn't connect to channels >= 116

Hi everyone,
I'm not sure since when this has been happening, but my A1 (latest OEM updates installed) doesn't want to connect to 5 GHz WiFis when they use a channel starting from 116, as it seems.
This is very annoying because on dual-band WiFi routers, when it tries to switch from 2.4 GHz to 5 GHz (especially when both use the same SSID), it can't connect and drops the connection completely. This happens every few minutes.
For my own WiFi networks, I can work around by manually setting a channel < 116 or setting different SSIDs for both frequencies. But on WiFi networks that I don't control, I don't know what to do.
Any ideas? Does anyone have the same problem? Was it caused by a recent update? Is there a way to disable 5 GHz WiFi support on the phone itself?
Thanks for any input.

I am affected also by this problem.
I did like you on my router but can't do the same for the office.
As far as i know the solution is to roll back to oreo.
I am not sure if CyanogenMod helps on that point, if it is i will for sure flash my phone.

TomasRiker said:
Hi everyone,
I'm not sure since when this has been happening, but my A1 (latest OEM updates installed) doesn't want to connect to 5 GHz WiFis when they use a channel starting from 116, as it seems.
This is very annoying because on dual-band WiFi routers, when it tries to switch from 2.4 GHz to 5 GHz (especially when both use the same SSID), it can't connect and drops the connection completely. This happens every few minutes.
For my own WiFi networks, I can work around by manually setting a channel < 116 or setting different SSIDs for both frequencies. But on WiFi networks that I don't control, I don't know what to do.
Any ideas? Does anyone have the same problem? Was it caused by a recent update? Is there a way to disable 5 GHz WiFi support on the phone itself?
Thanks for any input.
Click to expand...
Click to collapse
Wifi channels >116 works on Oreo. It looks like Pie messed wifi in several ways.
Rolling back to Oreo is more difficult because of ARB (or something else with Pie) but it can be done.

barrack1 said:
Wifi channels >116 works on Oreo. It looks like Pie messed wifi in several ways.
Rolling back to Oreo is more difficult because of ARB (or something else with Pie) but it can be done.
Click to expand...
Click to collapse
Thanks for the info. I've been thinking: Could it be related to country-specific regulations? Not all channels can be legally used in all countries. Maybe the phone thinks that it is located in such a country. Logcat doesn't give me any useful info unfortunately.

TomasRiker said:
Thanks for the info. I've been thinking: Could it be related to country-specific regulations? Not all channels can be legally used in all countries. Maybe the phone thinks that it is located in such a country. Logcat doesn't give me any useful info unfortunately.
Click to expand...
Click to collapse
You're right it could, its not allowed in US, Russia, Australia according to wikipedia. I'm on Oreo so I don't know if its a Pie or region thing for sure.
No idea if the wiki is correct/updated:
https://en.wikipedia.org/wiki/List_of_WLAN_channels#5_GHz_(802.11a/h/j/n/ac/ax)

Strange 5GHz problem with G6

I’ve got a very strange problem with my LG G6.
I have always been able to detect and connect to all wifi, including 5GHz, from any router. Recently I’ve noticed that my G6 cannot detect the 5GHz from a certain router we have in our home. It can detect 5GHz from any other router (in or out of the house), and it detects the 2.4GHz from the said router, but it cannot detect the 5GHz from the said router. Everyone else in the family can detect and connect to the 5GHz of the said router. I’m the only one who can’t. I’ve rebooted the phone and router many times. Tried different channels and settings. Nada. Can anyone please shed some light on this dilemma?

can you connect to other 5 Ghz networks?
Are you on stock ROM?

SkylineDiT said:
can you connect to other 5 Ghz networks?
Are you on stock ROM?
Click to expand...
Click to collapse
Yes. Like I said, I can detect and connect to all the other 5GHz routers that I come across. Only this one I can't. Yet everyone else can detect and connect to it. I'm the only one who can't and I'm totally baffled. I'm running stock ROM updated to Android 9 long ago.

In case of a missing or unregistered sim card the phone supports only channels 36-48, otherwise the national channel range.
At least half of all routers are missing the DFS feature and support only channels 36-48,which is fine in this case. I wouldn't want to own one of these.
I your sim card is a local network provider's and not a foreign one in roaming mode, things get more complicated, but it should be a matter of localization.