Bug 1310389 - Brightness changes itself on Gnome 3
Brightness changes itself on Gnome 3
Product: Fedora
Classification: Fedora
Component: gnome-shell (Show other bugs)
x86_64 Linux
unspecified Severity unspecified
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Assigned To: Owen Taylor
Fedora Extras Quality Assurance
Depends On:
  Show dependency treegraph
Reported: 2016-02-21 04:46 EST by Orsiris de Jong
Modified: 2016-12-20 13:54 EST (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2016-12-20 13:54:26 EST
Type: Bug
Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
The part of journalctl that matters (4.47 KB, text/plain)
2016-02-21 04:46 EST, Orsiris de Jong
no flags Details
dmesg log (83.62 KB, text/plain)
2016-02-21 04:47 EST, Orsiris de Jong
no flags Details
glxinfo (23.68 KB, text/plain)
2016-02-21 04:47 EST, Orsiris de Jong
no flags Details

  None (edit)
Description Orsiris de Jong 2016-02-21 04:46:38 EST
Created attachment 1128940 [details]
The part of journalctl that matters

Description of problem:

I'm running Fedora 23 with a new skylake laptop (HM170 chipset).
Laptop bios and Fedora are up-to-date.

In order to get Intel HD 530 Graphics acceleration working, I had to switch to a newer kernel which is 4.4.2-300.vanilla.knurd.1.fc23.x86_64 found on fedora's thl repository.
I'm running without kernel options, but disabled cstates in bios because linux couldn't boot.

Now every few minutes, gnome3 shoes the backlight control (the small square that appears when you would change backlight intensity), and indeed the intensity modifies.

This isn't a keyboard issue, the brightness just changes itself.
I've checked in journalctl and indeed the backlight log is there.

Attached files are journalctl part, dmesg and glxinfo.
Comment 1 Orsiris de Jong 2016-02-21 04:47 EST
Created attachment 1128941 [details]
dmesg log
Comment 2 Orsiris de Jong 2016-02-21 04:47 EST
Created attachment 1128942 [details]
Comment 3 Chris Murphy 2016-03-28 20:24:51 EDT
What happens if you go to Settings > Power > and set Automatic brightness to off? This is just to help isolate the problem.
Comment 4 Orsiris de Jong 2016-03-29 04:06:57 EDT
Tried to disable automatic brightness when idle (only option I have here), does the same behavior.

Btw, now running stock Fedora Kernel 4.4.6-300.fc23.x86_64 so I guess there's no relationship between this and the brightness changes.
Comment 5 Orsiris de Jong 2016-03-29 04:45:57 EDT
Just observed some more behavior:
After a while, the brightness stopped changing itself.

A half hour later, my battery was about 15% so I plugged the AC adapter. On plugging the power supply, the brightness began changing itself again for a while, so the problem is definitly energy saving related.
Comment 6 Fedora End Of Life 2016-11-24 10:40:36 EST
This message is a reminder that Fedora 23 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 23. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '23'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

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able to fix it before Fedora 23 is end of life. If you would still like 
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of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
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more recent Fedora release includes newer upstream software that fixes 
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Comment 7 Fedora End Of Life 2016-12-20 13:54:26 EST
Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
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