[Bug 94014] Failure to wake monitor after sleep on Haswell graphics driver under 4.4.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94014

--- Comment #12 from Brownout <brovvnout+bugzilla at gmail.com> ---
I'm getting the same behavior on Fedora 23 (4.4.4-301.fc23.x86_64, but these
issues started with a previous 4.4 kernel), Ivy Bridge with integrated Intel HD
Graphics 2500, monitor on HDMI, xorg-x11-drv-intel-2.99.917-19.20151206 from
Fedora.

Xorg.0.log shows this line while switching from a text VTY to display :0
(EE) intel(0): sna_mode_shutdown_crtc: invalid state found on pipe 0, disabling
CRTC:21

I've already tried to wake up the monitor via xset dpms to no avail.
I noticed that if the monitor is already powered up while resuming from suspend
to memory it will exit from standby mode, otherwise it'll stay "no signal/power
save" until X is killed.

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