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[Derek Chen-Becker <969860@xxxxxxxxxxxxxxxxxx>]

Here's my stack trace. dstack kept hanging, so I just ran gdb manually.
This appears to be the same bug, but the workarounds don't help. This is
a:

01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI
Manhattan [Mobility Radeon HD 5430 Series]

And the ioctl that loops is

ioctl(13, 0xc00c645c, 0x7fff5a9fde00)   = 0

Where 13 is /dev/ati/card0. fglrx is 2:8.960-0ubuntu1, x86_64, Ubuntu
12.04

** Attachment added: "dstack.trace"
   https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/969860/+attachment/3221797/+files/dstack.trace

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https://bugs.launchpad.net/bugs/969860

Title:
  fglrx uses 100% CPU when screen turns off (spinning in
  glXWaitVideoSyncSGI or glXSwapBuffers)

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