Created attachment 122698 [details] kernel log w drm.debug=0x6 We've received a report that the backlight brightness behaves non-linear on a VLV (PCI DevID: 0x0f31) with kernel 4.5 or any eariler kernel. Driver seems to use the vlv_*_backlight() functions. The brightness range is: 0 - 7812. Written to /sys/class/backlight/intel_backlight/brignness 0 and 7812 give black, 1 and 4687 both give full brightness.
(In reply to Egbert Eich from comment #0) > Created attachment 122698 [details] > kernel log w drm.debug=0x6 > > We've received a report that the backlight brightness behaves non-linear on > a VLV > (PCI DevID: 0x0f31) with kernel 4.5 or any eariler kernel. Driver seems to > use the vlv_*_backlight() functions. > > The brightness range is: 0 - 7812. > Written to /sys/class/backlight/intel_backlight/brignness 0 and 7812 give > black, 1 and 4687 both give full brightness. We seem to have neglected the bug a bit, apologies. Egbert Eich, since There were improvements pushed in kernel that will benefit to your system, so please re-test with latest kernel and mark as REOPENED if you can reproduce (and attach fresh gpu error dump & kernel log) and RESOLVED/* if you cannot reproduce.
(In reply to yann from comment #1) > (In reply to Egbert Eich from comment #0) > > Created attachment 122698 [details] > > kernel log w drm.debug=0x6 > > > > We've received a report that the backlight brightness behaves non-linear on > > a VLV > > (PCI DevID: 0x0f31) with kernel 4.5 or any eariler kernel. Driver seems to > > use the vlv_*_backlight() functions. > > > > The brightness range is: 0 - 7812. > > Written to /sys/class/backlight/intel_backlight/brignness 0 and 7812 give > > black, 1 and 4687 both give full brightness. > > We seem to have neglected the bug a bit, apologies. > > Egbert Eich, since There were improvements pushed in kernel that will > benefit to your system, so please re-test with latest kernel and mark as > REOPENED if you can reproduce (and attach fresh gpu error dump & kernel log) > and RESOLVED/* if you cannot reproduce. Timeout - assuming resolved+fixed. If problem still persist with the latest kernels (preferable drm-tip from git://anongit.freedesktop.org/git/drm-tip), reopen this bug with latest logs as attachments.
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