Poor wi-fi signal level with 4.12 kernel

arun_kpm · 2017-07-13 02:32:07

I am getting very low wifi signal level with 4.12 kernel on rtl8723be.
I already have "options rtl8723be ant_sel=1" in /etc/modprobe.d/rtl8723be.conf

4.11.3 kernel

4.11.9 kernel

4.12.0 kernel

Last edited by arun_kpm (2017-07-30 10:32:04)

R00KIE · 2017-07-13 09:40:09

This looks like something you want to bisect and report upstream once you find the commit that breaks things.

arun_kpm · 2017-07-13 11:10:48

R00KIE wrote:

This looks like something you want to bisect and report upstream once you find the commit that breaks things.

I found the commit which broke the wifi driver https://github.com/torvalds/linux/commi … d7a214ef84.
I changed the commit to old values, now it works fine.
Thanks.

Last edited by arun_kpm (2017-07-13 11:11:16)

R00KIE · 2017-07-13 12:51:05

You should report that in the kernel bug tracker or the bug tracker specific for wifi drivers, otherwise it will not get fixed. Once you report the problem upstream leave a link here so other people affected by the same problem can follow the discussion.

arun_kpm · 2017-07-13 14:17:35

R00KIE wrote:

You should report that in the kernel bug tracker or the bug tracker specific for wifi drivers, otherwise it will not get fixed. Once you report the problem upstream leave a link here so other people affected by the same problem can follow the discussion.

It is already fixed in 4.12.1 source code.

loqs · 2017-07-13 17:01:55

arun_kpm wrote:

It is already fixed in 4.12.1 source code.

Do you have a link to the fix in 4.12.1? From the changelog I could not see anything obviously related.

arun_kpm · 2017-07-14 08:00:21

loqs wrote:

arun_kpm wrote:
It is already fixed in 4.12.1 source code.
Do you have a link to the fix in 4.12.1? From the changelog I could not see anything obviously related.

yeah. I can't see any commits. if I compile the kernel myself from 4.12.1 source code, wifi is working but it is not with stock arch 4.12.1 kernel which is got it from testing repositories. I am doing something wrong.

R00KIE · 2017-07-14 08:35:59

Maybe you are compiling the current git version and not the current stable?

arun_kpm · 2017-07-30 10:31:37

R00KIE wrote:

Maybe you are compiling the current git version and not the current stable?

By mistake I compiled 4.11 kernel.
by the way I updated the kernel to 4.12 from stable repository now I am having low WiFi strength and I can't find maintainer for rtl8723be in https://www.kernel.org/doc/linux/MAINTAINERS. any suggestions please?

R00KIE · 2017-07-30 11:12:51

There should be a kernel mailing list for wireless/wifi development/issues where you can ask, and you always have the option of submitting a bug report, but before you do make sure to compile the current git version and see if it still has the same problem.

diegoviola · 2017-07-31 04:09:53

Deleted.

Last edited by diegoviola (2023-04-17 14:57:50)

arun_kpm · 2017-07-31 16:29:16

diegoviola wrote:

I read this commit fixes your issue:
https://git.kernel.org/pub/scm/linux/ke … 834cce3e1f
Please try Linux 4.13-rc3 and see if it fixes your issue.

Applied that patch to 4.12.3 kernel source but it causes kernel panic.

R00KIE · 2017-07-31 16:56:16

Why don't you just try compiling a git kernel? Randomly applying patches without knowing if they depend on other changes done after 4.12.3 was released can lead to problems as you have found.

arun_kpm · 2017-08-01 06:15:20

R00KIE wrote:

Why don't you just try compiling a git kernel? Randomly applying patches without knowing if they depend on other changes done after 4.12.3 was released can lead to problems as you have found.

Because using git clone is very slow. I get slow speeds like 20 ~ 50 KiB/s when using git clone.

jeremy31 · 2017-08-02 10:33:41

Have you tried an unpatched 4.12 with fwlps=N set as a module parameter for rtl8723be?
It seems the commit diegoviola mentioned has already been reverted https://git.kernel.org/pub/scm/linux/ke … 1cf7d87687

arun_kpm · 2017-08-02 12:27:33

jeremy31 wrote:

Have you tried an unpatched 4.12 with fwlps=N set as a module parameter for rtl8723be?
It seems the commit diegoviola mentioned has already been reverted https://git.kernel.org/pub/scm/linux/ke … 1cf7d87687

Yes, I've tried that too still ant_sel parameter doesn't seem to work.

diegoviola · 2017-08-10 18:49:15

Deleted.

Last edited by diegoviola (2023-04-17 14:58:33)

loqs · 2017-08-10 18:58:30

diegoviola wrote:

I read the fix is in this repo

You read this where? Please provide the link to your source.

diegoviola · 2017-08-10 19:09:30

Deleted.

Last edited by diegoviola (2023-04-17 14:58:15)

loqs · 2017-08-10 19:18:05

Thank you for the explanation. So someone affected has to build the kernel from https://git.kernel.org/pub/scm/linux/ke … -next.git/

Arch Linux

#1 2017-07-13 02:32:07

Poor wi-fi signal level with 4.12 kernel

#2 2017-07-13 09:40:09

Re: Poor wi-fi signal level with 4.12 kernel

#3 2017-07-13 11:10:48

Re: Poor wi-fi signal level with 4.12 kernel

#4 2017-07-13 12:51:05

Re: Poor wi-fi signal level with 4.12 kernel

#5 2017-07-13 14:17:35

Re: Poor wi-fi signal level with 4.12 kernel

#6 2017-07-13 17:01:55

Re: Poor wi-fi signal level with 4.12 kernel

#7 2017-07-14 08:00:21

Re: Poor wi-fi signal level with 4.12 kernel

#8 2017-07-14 08:35:59

Re: Poor wi-fi signal level with 4.12 kernel

#9 2017-07-30 10:31:37

Re: Poor wi-fi signal level with 4.12 kernel

#10 2017-07-30 11:12:51

Re: Poor wi-fi signal level with 4.12 kernel

#11 2017-07-31 04:09:53

Re: Poor wi-fi signal level with 4.12 kernel

#12 2017-07-31 16:29:16

Re: Poor wi-fi signal level with 4.12 kernel

#13 2017-07-31 16:56:16

Re: Poor wi-fi signal level with 4.12 kernel

#14 2017-08-01 06:15:20

Re: Poor wi-fi signal level with 4.12 kernel

#15 2017-08-02 10:33:41

Re: Poor wi-fi signal level with 4.12 kernel

#16 2017-08-02 12:27:33

Re: Poor wi-fi signal level with 4.12 kernel

#17 2017-08-10 18:49:15

Re: Poor wi-fi signal level with 4.12 kernel

#18 2017-08-10 18:58:30

Re: Poor wi-fi signal level with 4.12 kernel

#19 2017-08-10 19:09:30

Re: Poor wi-fi signal level with 4.12 kernel

#20 2017-08-10 19:18:05

Re: Poor wi-fi signal level with 4.12 kernel

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