I'm also affected by this bug, when running both glxgears and Gazebo simulator (or, its graphical client using OpenGL).
Switching to a terminal (Ctrl+Alt+F1) and back unfreezes the screen for a while. The screen only looks frozen, but normally reacts to mouse and keyboard events. This only happens if the GL window is displayed on my primary display (which is handled by the intel integrated chip). The notebook has 2 video outputs and a discrete AMD graphics, and I think only one of the outputs is handled by the AMD card, so I think one of the outputs is handled by the intel card and does not get frozen. Ubuntu 14.04.3 64bit. I think that before upgrading from 14.04.2 to 14.04.3 this did not happen. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1501260 Title: drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1501260/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
