[Bug 70145] Random blank screen after login with Haswell 4400

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70145

--- Comment #16 from Maksim Lin <maks at manichord.com> ---
Ok maybe I got the wrong end of the stick there - I just tried:

cat /proc/sys/kernel/tainted
2

and according to this
(http://kmaiti.blogspot.com.au/2011/09/how-to-check-whether-current-running.html)
it means I have done a forced module load, but I have just booted (ubuntu
12.02.3) and done no such thing myself - does ubuntu to this for some reason in
a init script for some reason?

More to the point: I have found my trial&error that doing a switch from virt
console 7 to 1 then back into X again and then suspending the laptop and waking
it again immediately does seem to bring the screen back on again. Doing jsut
one of those 2 actions does not. Though it seems that after 3 or 4 times of
doing that, that stops working too and then nothing short of force powering
down, pulling battery and restarting fixes it.

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