With the open radeon driver, I found a way to fix this problem. If I modify the GRUB_CMDLINE_LINUX_DEFAULT line in /etc/default/grub and add "radeon.audio=1", the HDMI output is always visible in the list of outputs.
my /etc/default/grub line now looks like this: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1 radeon.pcie_gen2=1" Hope this helps -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/956378 Title: Flash Plugin has no sound after unplugging HDMI cable Status in “gnome-control-center” package in Ubuntu: Confirmed Bug description: On Ubuntu Precise 12.04, HDMI sound ouput cannot be selected if the HDMI cable is not plugged in. Let's consider this scenario: - plug the HDMI cable, - change the sound output to HDMI - play a flash video in chromium, the sound goes through the HDMI, - changing the output to internal speaker, the internal speaker plays the flash sound - unplug the HDMI cable, the internal speaker still plays the flash sound now: - plug the HDMI cable back, and select the sound output to HDMI - play some youtube video, and unplug the HDMI cable Flash doesn't switch automatically back to the internal speaker. Even trying to select it the internal speakers as output doesn't solve this problem, still no sound in flash. It looks like the Volume Control Center doesn't set some parameter back when the HDMI output is selected and the cable unplugged. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/956378/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp