This looks like memory corruption in the open driver. Does installing the 14.04.2 stack (lts-utopic) help?
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1330334 Title: AMD Radeon HD 8400 [1002:9830] Garbled display with open-source driver on Trusty To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1330334/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
