[Bug 94813] [VLV, backlight] Backlight Brighness not linear
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Mar 17 15:26:47 UTC 2017
https://bugs.freedesktop.org/show_bug.cgi?id=94813
yann <yann.argotti at intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
--- Comment #1 from yann <yann.argotti at intel.com> ---
(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.
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