Bug 1051904

Not reproducible here, with

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c)

may be a driver issue.

Sorry, I just found out that there is a strange trigger which is not easy to reproduce.
After reboot everything works fine.

Steps:
1. I have auto-login (user1) to GUI (VT1).
2. Open konsole, start top.
2. Login to VT2 also user1 - console only (not GUI).
3. Start top on VT2.

4. Switch randomly between VT1, VT2 and VT3 (nobody logged in) several times.
Kwin runs normally.

5. Start firefox (VT1), play a Flash video. 
(Used this https://www.youtube.com/watch?v=aRSZeTPQFAE)

6. Switch randomly between VT1, VT2 and VT3  several times.
Kwin runs normally.
Note: The sound from the Flash video is also present when running on VT2. There is no sound for VT3++.

7. Maximize/Full screen the Flash video.
8. Switch randomly between VT1, VT2 and VT3  several times.
At some point it happens, kwin goes up to 99%CPU for VT2, VT3++.

9. Then Full screen can be left, the Firefox Tab with the Flash can be closed, even whole Firefox can be closed. Kwin still goes up to 99%CPU for VT2, VT3++ and goes back to normal for VT1.

10. Reboot fixes the problem.

It seems that somehow the Full screened video plays role in triggering the issue, but I am not 100% sure.

I was able to reproduce the issue also with user1 logged into KDE on VT1. Then after 'Switch User' user2 logged into KDE on VT2, steps same as above.


Additional video, driver related packages:
# yum list installed | grep -i ^mesa
mesa-dri-drivers.x86_64       9.2.5-1.20131220.fc20   @updates
mesa-filesystem.x86_64        9.2.5-1.20131220.fc20   @updates
mesa-libEGL.x86_64            9.2.5-1.20131220.fc20   @updates
mesa-libGL.x86_64             9.2.5-1.20131220.fc20   @updates
mesa-libGLU.x86_64            9.0.0-4.fc20            @updates
mesa-libgbm.x86_64            9.2.5-1.20131220.fc20   @updates
mesa-libglapi.x86_64          9.2.5-1.20131220.fc20   @updates
mesa-libwayland-egl.x86_64    9.2.5-1.20131220.fc20   @updates
mesa-libxatracker.x86_64      9.2.5-1.20131220.fc20   @updates
mesa-vdpau-drivers.x86_64     9.2.5-1.20131220.fc20   @updates

# yum list installed | grep -i nouv
xorg-x11-drv-nouveau.x86_64   1:1.0.9-2.fc20          @fedora

#yum list installed | grep -i ^kern
kernel.x86_64                 3.12.6-300.fc20	      @updates
kernel-modules-extra.x86_64   3.12.6-300.fc20	      @updates

flash-plugin.x86_64           11.2.202.332-release    @adobe-linux-x86_64

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