[Bug 68471] Display extremely dark on Dell XPS 13 since 3.10 Kernel in EFI mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68471

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |daniel at ffwll.ch
         Regression|No                          |Yes

--- Comment #1 from Daniel Vetter <daniel at ffwll.ch> ---
Please try to adjust the brightness directly through the sysfs interfaces in
/sys/class/brightness/*

Please do this on both older (working) kernels and newer broken releases and
list for each backlight what happens.

Also please retest with latest 3.13-rc kernels, there's tons of backlight
adjustments. Finally please attach the output of dmesg and lspci -nn.

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