I can reproduce this also, just mplayer some video and wait until screensaver starts to dim the screen. Also happened with other screen candy activity while doing some audio production.
Workaround: use DE with no effects enabled. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/979446 Title: [i965gm] False GPU lockup render.IPEHR: 0x60020100 To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/979446/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp