HDMI no sound
"HDMI Audio is disabled by default on kernel 3.0+ due to a black screen on some monitors. To get audio working again go to: etc/default/grub Open grub as administrator with a text editor. Then change the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1" Type on the terminal: sudo update-grub Reboot and your HDMI sound will work again." http://community.linuxmint.com/tutorial/view/1051