Reverting today's update of systemd/udev back to the previous release fixes the problem for me:
sudo dpkg -i /var/cache/apt/archives/*204-5ubuntu15* ** Also affects: systemd (Ubuntu) Importance: Undecided Status: New ** Changed in: systemd (Ubuntu) Status: New => Confirmed ** Changed in: systemd (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1302270 Title: [regression] Poor performance with recent update with i965: libGL error: failed to open drm device: Permission denied To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/1302270/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs