[Bug 94813] [VLV, backlight] Backlight Brighness not linear

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94813

yann <yann.argotti at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEEDINFO                    |RESOLVED

--- Comment #2 from yann <yann.argotti at intel.com> ---
(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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