[Bug 80182] [IVB regression] screen not resuming on kernel 3.14.6 and above

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80182

--- Comment #23 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
(In reply to comment #18)
> > Also can you please try adding: "video.use_native_backlight=0" the the
> > kernel commandline with 3.14.6? That should fix things if your bisect has
> > found the right commit as the culprit.
> 
> Adding that boot option to 3.14.6, screen resumes OK

Ok, so that patch really is the culprit. I'm afraid though that reverting it
for <= 3.15 may cause regressions for other T430 users, and with 3.16 we would
actually need to add a quirk for your model to force
video.use_native_backlight=0 there, as video.use_native_backlight=1 is the
default there now.

So first lets see if Jani can make any sense of the regdumps you've attached,
and then we'll go from there.

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