[Bug 63931] [7 Series] [Backlight] Incorrectly driver set backlight

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63931

Bastien Nocera <bugzilla at hadess.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|NOTOURBUG                   |---

--- Comment #5 from Bastien Nocera <bugzilla at hadess.net> ---
(In reply to comment #4)
> It is not a bug in -intel or i915.ko, but in the acpi driver for your
> backlight.

The backlight works fine when you hit the sysfs node directly, but the
backlight returned through XRandR (and xbacklight) always returns 100%. It's
possible that the driver always exposes the backlight interface, and returns
100 when it can't actually access the sysfs node for whatever reason as per the
commit below.

http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=d7f0df27edb20b052ad39beb26a0b1924f432618

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