Same issue occured on Ubuntu 14.04 LTS after upgrading kernel to 3.16, and Xorg (LTS hardware enablement program). Screen was frozen, but I was able to recover by switching to a VT and restarting X (switching eventually worked after a long delay). Never any problems of this sort with the 3.13-kernel. (Intel HD 4000 "Ivy Bridge").
[79486.195054] WARNING: CPU: 0 PID: 1751 at /build/buildd/linux-lts- utopic-3.16.0/drivers/gpu/drm/i915/intel_display.c:3324 intel_crtc_wait_for_pending_flips+0x171/0x180 [i915]() -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1384342 Title: kernel messages intel_crtc_wait_for_pending_flips correlate to compiz hang To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1384342/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
