[Bug 90617] [Haswell HD4400] Black screen switching to a VT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90617

--- Comment #6 from Cesare Leonardi <celeonar at gmail.com> ---
As you requested, i booted with drm.debug=0xe, then connected remotely with ssh
to save dmesg output.
In the attached ZIP there are 3 dmesg:

dmesg.1.txt
It's exactly what you requested: the last seconds are soon after i've triggered
a CTRL-ALT-F1 to switch to VT1.

dmesg.2.txt
This log is interesting because soon after saving dmesg.1.txt, the PC stopped
responding to ssh for several seconds. After then i thought it was freezed so i
tried to press the CAPS LOCK key to see if the corresponding led would switch
on.
With my surprise the LCD display resurrected and the ssh session became
responsive again.
This log seems to show a return from suspend, even if i've never triggered it.

dmesg.3.txt
This is similar to dmesg.1.txt: after the return to life of the display, i
triggereded two switch: one from VT1 to lightdm login manager (ok, it worked),
then a switch back to VT1. The screen went black again, and this log was taken
soon after.
But now i wasn't able to bring back the LCD to life as before and there weren't
any connection trouble. I've waited about ten minute.

Cesare.

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