That appears to have fixed it, really sorry for making this report without first checking the BIOS!
** Changed in: xorg (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518990 Title: Display corruption when using some QT programs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1518990/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs