You've installed AMD's proprietary fglrx/Catalyst driver and it no longer supports your card. Follow this procedure to restore the open- source radeon driver: http://wiki.cchtml.com/index.php/Ubuntu_Trusty_Installation_Guide#Removing_Catalyst.2Ffglrx
As for audio issue, please file a new bug, using the following command to gather audio info/logs automatically: ubuntu-bug audio ** Changed in: xorg (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/1351656 Title: no sound To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1351656/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs