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
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