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

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.

  Flash Plugin has no sound after unplugging HDMI cable

Status in “gnome-control-center” package in Ubuntu:

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

  - 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.

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