[Bug 94813] New: [VLV, backlight] Backlight Brighness not linear
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Apr 4 12:03:47 UTC 2016
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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