[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 #8 from Cesare Leonardi <celeonar at gmail.com> ---
(In reply to Cesare Leonardi from comment #6)
> 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.

Note that it's the first time that i've seen such behaviour, both the apparent
freeze and the display that restore itself.

And i cannot avoid to note that to reproduce this bug i usually press
CTRL-ALT-F1 and that the key to hibernate the PC is Fn-F1. I'm asking myself if
i could have pressed Fn together with CTRL or something else that could have
triggered the suspend... Even if i think no and the PC apparently stayed
powered on.

All that to warn about the fact that what happened in the quoted text could be
a misleading detail.

Cesare.

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