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

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 94813
           Summary: [VLV, backlight] Backlight Brighness not linear
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: eich at pdx.freedesktop.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: f.de.kruijf at gmail.com,
                    intel-gfx-bugs at lists.freedesktop.org
     i915 platform: BYT

Created attachment 122698
  --> https://bugs.freedesktop.org/attachment.cgi?id=122698&action=edit
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.

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