Red Hat Bugzilla – Bug 1310389
Brightness changes itself on Gnome 3
Last modified: 2016-12-20 13:54:26 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.
Created attachment 1128941 [details]
Created attachment 1128942 [details]
What happens if you go to Settings > Power > and set Automatic brightness to off? This is just to help isolate the problem.
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.
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.
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