I get the same problem running kubuntu after upgrading from 14.04 to 16.04.1. I normally have 2 USB mice connected, but this version of Kubuntu locks up as soon as I try to use the second mouse, so there were problems with first boot after the upgrade. It has also locked once with only one mouse. Only X is locked, as I can press ctrl-alt-F1 to switch to console 1, which switches after a couple of minutes delay, where I can login and run normally. If I switch back to X it is still locked, and takes a couple of minutes to switch out again.
PC - HP Compaq 8200 Elite SFF PC/1495, BIOS J01 v02.15 11/10/2011, video Intel, using i915 driver. 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) The logged error is WARNING: CPU: 3 PID: 3641 at /build/linux-dcxD3m/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b5/0x1c0 [drm]() Aug 4 12:39:11 Desktop-PC kernel: [12628.344505] vblank wait timed out on crtc 0 I have attached part of syslog showing this error, and several subsequent ones. This was the occasion with only a single mouse connected. I can upload more log files, including Xorg.log and kern.log, if they would be useful. If there is any useful information I could get from the text console please let me know. ** Attachment added: "syslog" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1583817/+attachment/4714358/+files/syslog-errors -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1583817 Title: WARNING: CPU: 1 PID: 865 at /home/kernel/COD/linux/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b0/0x1c0 [drm] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1583817/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
