[Bug 75085] New: Backlight does not increase to maximum on Lenovo Yoga 2 Pro

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75085

          Priority: medium
            Bug ID: 75085
          Assignee: chris at chris-wilson.co.uk
           Summary: Backlight does not increase to maximum on Lenovo Yoga
                    2 Pro
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: nico-freedesktop.org at schottelius.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

On the Lenovo Yoga 2 Pro, increasing the brightness to 100% using xbacklight,
does not increase it to the maximum (duh!).

How to reproduce:

# Find out maximal brightness
% cat /sys/class/backlight/intel_backlight/max_brightness 
937


# Go to non 100%
% xbacklight -set 50
% cat /sys/class/backlight/intel_backlight/brightness 
381


# Go to 100%
% xbacklight -set 100
% cat /sys/class/backlight/intel_backlight/brightness 
765

# Increasing the brightness via sysfs actually increases the brightness even
more
% echo 937 > /sys/class/backlight/intel_backlight/brightness


Software/Hardware:

[11:26] artist:~% pacman -Q | grep -i -e xorg-server  -e intel 
intel-dri 10.0.3-1
xf86-video-intel 2.99.910-1
xorg-server 1.15.0-5
xorg-server-common 1.15.0-5
xorg-server-devel 1.15.0-5
xorg-server-xnest 1.15.0-5
[11:26] artist:~% 

[11:26] artist:~% uname -a
Linux artist 3.12.9-2-ARCH #1 SMP PREEMPT Fri Jan 31 10:22:54 CET 2014 x86_64
GNU/Linux


[11:21] artist:~% lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09)

[11:27] artist:~% lspci -n | grep 00:02.0
00:02.0 0300: 8086:0a16 (rev 09)
[11:27] artist:~% 

CPU: Intel(R) Core(TM) i7-4500U

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