From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 83331] radeon: Laptop panel out of sync after dpms
standby/suspend/off
Date: Sun, 14 Sep 2014 09:43:22 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=83331
--- Comment #5 from Klaus Kusche ---
Any news on this one?
Some more info's:
1.) Still there on 3.16.2.
2.) My workaround (disabling and re-enabling the internal output) takes ages:
~: time xrandr --output eDP --off ; time xrandr --output eDP --auto
real 0m0.516s
user 0m0.003s
sys 0m0.004s
real 0m7.832s
user 0m0.000s
sys 0m0.003s
Times are very reproducible, almost constant (+/- 5 ms only).
During these commands, the system is more or less blocked,
in spite of the CPU being idle.
Also, the first timing is not displayed after half a second
on the external monitor as one would expect from its real time,
but after 6 seconds, one second before the second timing.
What are these commands doing that long?
3.) A similar problem seems to affect switching from VGA to FB console
during kernel bootup:
* It takes ages (I counted more than 5 seconds on a really fast machine).
* It sometimes shows the same strange white moving stripes
during the switch.
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