https://bugzilla.kernel.org/show_bug.cgi?id=83331
--- Comment #5 from Klaus Kusche klaus.kusche@computerix.info --- 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.