[Bug 52311] Flash 11.5 video hangs ivy bridge

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=52311





--- Comment #7 from Christoph Haag <haagch.christoph at googlemail.com>  2013-01-04 21:17:11 ---
Well, this is frustrating to test. It seems to have something to do with how
the crtcs are configured but I have not found out any pattern...


This is how enabling only hdmi finally worked conistently:

xrandr --output LVDS1 --off --output HDMI1 --preferred ; sleep 2 ; xrandr
--output HDMI1 --off ; xrandr --output HDMI1 --preferred --crtc 1

When just randomly enabling and disabling hdmi only it sometimes seemed to work
but went black as soon as the kwin compositor did anything and without
compositing it mostly worked... But with the above command it consistently
works.



So with HDMI1 only there usually is no hang with any of the crtcs. After
playing around a bit with dual settings and comming back to HDMI1 only with
crtc 1 the hang happened once. But usually it doesn't.

Actually according to xrandr --verbose without any parameters LVDS1 seems to be
connected via crtc 1 and HDMI1 via crtc 0.
So the hang originally happened with crtc 0 on the external screen, but not
with crtc 1 on the internal screen.
When I tried just switching them, internal with crtc 0 and external with crtc
1, the hang just happened on both screens.

I have not tried all 9 possible combinations, but it mostly seems to cause the
hang everywhere. Maybe tomorrow I'll be up for a more systematic test.

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