[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 #17 from drewvs at gmail.com ---
Save your breath it seems things like this never get solved, I returned the
laptop and bought a different one...

I had the same behavior with tty terminals too...

Sent from my mobile, please pardon the brevity.
On Apr 2, 2014 8:08 PM, <bugzilla-daemon at freedesktop.org> wrote:

>   *Comment # 16 <https://bugs.freedesktop.org/show_bug.cgi?id=70145#c16>
> on bug 70145 <https://bugs.freedesktop.org/show_bug.cgi?id=70145> 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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