[Bug 85861] backlight control doesn't work on Lenovo t440p after upgrading to 3.17 [bisected]

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=85861

--- Comment #3 from Dmitry Nezhevenko <dion at inhex.net> ---
Created attachment 152921
  --> https://bugzilla.kernel.org/attachment.cgi?id=152921&action=edit
dmesg with drm.debug

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