my dmesg says:

perf samples too long (2511 > 2500), lowering
kernel.perf_event_max_sample_rate to 50000


how to reproduce:

play several flash videos in web browser. After a while, video is
cutting. And after a while, noveau is scrashing.

Maybe this helps: http://comments.gmane.org/gmane.linux.kernel/1520775

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https://bugs.launchpad.net/bugs/1242767

Title:
  computer freeze trying to exit "gnome-control-center"

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