Public bug reported: Using kernel 4.4.0 from Ubuntu GNOME 16.04 I get a lot of warnings 'drm_wait_one_vblank timed out' while booting and every time when I switch user or session via Alt-Fn. Example logs will be attached, I used this for saving the log:
journalctl -b --system --no-pager |tee bootlog-$(uname -r)-$(lsb_release -sr) I suspect this may be related to some of my problems (slow switch, freeze, wrong VT: Alt-Fn6 roots to tty3) when switching virtual terminal. I see these messages on 16.04 or 14.04 when using kernel 4.4.0-21-generic, 4.4.0-22-generic or mainline kernel 4.4.0-040400-generic or 4.5.2-040502-generic, but mainline kernel 4.3.6-040306-generic does not throw this message and there are no problems with 4.3.6 while switching VT. ** Affects: ubuntu Importance: Undecided Status: New ** Tags: 4.4.0 kernel-bug trusty xenial ** Attachment added: "bootlog-4.4.0-22-generic-16.04" https://bugs.launchpad.net/bugs/1580697/+attachment/4660822/+files/bootlog-4.4.0-22-generic-16.04 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1580697 Title: Kernel freezes after drm_wait_one_vblank timed out To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1580697/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs