[Bug 80930] [regression] WARNING ... i965_enable_backlight ... backlight already enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80930

--- Comment #6 from Pedro Ribeiro <eusou15 at yahoo.com> ---
Created attachment 104527
  --> https://bugs.freedesktop.org/attachment.cgi?id=104527&action=edit
dmesg debug=0xe

I can reproduce this consistently by booting up, hibernating, resuming,
hibernating again and resuming again. From the second resume onwards, the bug
appears at least at every resume. Please see attached dmesg log with
drm.debug=0xe - the bug trace starts at 4274. 

I have a Lenovo T400 with GM45 and I'm connecting it to an external monitor via
a docking bay and disabling the LVDS screen. I've tried using xrandr to
disconnect the external monitor and connect the internal screen but the bug
appears to happen anyway.

This happens with 3.14.14 and 3.15.9. It did not happen with the 3.13 series
kernels. 
Let me know if you need more information.

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