I have lots of very unlikely suspects. The biggest question is why is the corruption appearing on only a very small number of machines (1)?
Can you please track the latest gfx drivers from ppa:xorg-edgers and drm-intel-nightly kernel from ppa:mainline? -- 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/1157458 Title: visual glitch in Evolution's importance button, etc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1157458/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

