compiz team mailing list archive

[Bryce Harrington <745839@xxxxxxxxxxxxxxxxxx>]

No, not really a driver issue.  Rather, you're pushing the hardware
beyond its capabilities.

The X300 radeon card in the Xpress 200M is capable only of a maximum
2048x2048 combined screen dimension when running compiz.  See bug
#555641.

Arrange your screens top/bottom instead of left/right and you should be
fine (it'll fit inside the 2048x2048 limit.)  Also, remove the virtual
resolution specification in your xorg.conf - shouldn't be needed
anymore.

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https://bugs.launchpad.net/bugs/745839

Title:
  compiz crashed with SIGSEGV in pthread_mutex_lock()