Actual behavior: Every time I connect an external display, my internal panel brightness is brought to 0. Expected behavior: The internal panel brightness doesn't change when there is a desktop displayed on it.
Created attachment 139871 [details] log of external monitor connection with drm.debug=0x4 and module backlight +fpt
Please attach dmesg from early boot with drm.debug=0xe module parameter set, exhibiting the problem. Is this a regression? Did this work in the past?
This seems to be the same issue as reported here: https://bugzilla.redhat.com/show_bug.cgi?id=1012674 Which is actually an issue in xf86-video-intel, which has been fixed in the recent 2.99.912 release, please give that version a try.
(In reply to Hans de Goede from comment #3) > This seems to be the same issue as reported here: > https://bugzilla.redhat.com/show_bug.cgi?id=1012674 > > Which is actually an issue in xf86-video-intel, which has been fixed in the > recent 2.99.912 release, please give that version a try. Upgrade of xf86-video-intel package solved my problem indeed. Thank you very much.
Anton, thanks for the report and testing. Hans, thanks for your continued help in nailing down the backlight bugs!