Peter Cordes, thank you for reporting this and helping make Ubuntu better. As per https://wiki.ubuntu.com/Releases 15.10 is EOL.
If you have an issue in a supported release (ex. 16.04) please file a new report, and feel free to subscribe me to it. ** Changed in: xserver-xorg-video-ati (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1602097 Title: X lockup while playing a video (VDPAU) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1602097/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs