At each reboot, PulseAudio set the profil "HDMI Audio Output" as the default one. So, at each reboot, I haven't the sound under Maverick, and need to reconfigure it each time, to the "Analog Output" !
How can I remove/disable this HDMI thing?
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I found this suggestion https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/346753/comments/3
which states you should edit the pulseaudio settings
I checked and the approach should still be valid in 10.10
1. Delete User Settings
Another approach prior to editing the default.pa would be to rename the hidden directory
2. Edit Defaults
Only if this has no effect for your system then maybe udev loads the HDMI interface as default sink. Then one approach could be as already mentioned by HagenaarsDotNu to edit the default.pa. Mind to make a backup of the current default.pa. Look for this section which is pretty self-explaining (mind that hal-detect will not work in Ubuntu >10.04).
3. The Elegant Way
Another more elegant way to get audio working is to enable "Simultaneous Output" from paprefs as depicted here:
This enables audio output on both, the internal audio, and the HDMI-Interface. Make this virtual output device your default and you have all options at your hands.