[Bug 84182] [HSW] i915: Freeze after DPMS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84182

--- Comment #5 from Franz Fellner <alpine.art.de at googlemail.com> ---
This happened again yesterday, with mesa-10.2.8 - so no regression, at least
not in mesa.
It happened while viewing a video in fullscreen, which also was the first time
I saw this happen. But this also happened during regular use without any
multimedia application running. It even happened after a fresh reboot, no
window open and absolutely no activity.
This particular machine is running most recent kde desktop.

But I had this also on my Laptop, a Lenovo ThinkPad L520, no external monitor
plugged in. I am running awesome WM with compton. It happened while watching a
Video, also fullscreen, in flash + firefox (if that matters). I manually turned
off dpms and screensaver using xset.

The only solution to get the monitor repainted again is to switch to another
TTY (CTRL+ALT+Fx). It will take ~2 minutes until I see the terminal login. I
then can switch back to my Xsession, everything seems to work fine, then.

I did not yet find a regular pattern to trigger this bug, it seems to happen
quite randomly.

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