correction: right after posting my last response, i've used alt-tab and my system hang again. here ist the xorg.0.log.old might be interesting:
** Attachment added: "[mi] EQ overflowing. The server is probably stuck in an infinite loop." http://launchpadlibrarian.net/24922616/Xorg.0.log.old -- should use XAA for acceleration on i845 because EXA acceleration is known to cause instabilities https://bugs.launchpad.net/bugs/355441 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
