Thank you very much for your links and the bunch of very useful commands. The MCC tells me that the Radeon card is using the "snd_hda_intel" driver. The mainboard is having an integrated sound card (line out) and the video adapter is a AMD Radeon 6450. Besides in the 'Audio Hardware Setup' tab, I can successfuly test Front Left/Right over HDMI and Line Out. Otherwise no device is displayed at all under Music-Device Preference. I have to close totally the system settings window and come back again to test. Note that if I use 'Test', first time sound is coming, next time I get the error "Failed to set the selected audio output device". I tried to tinker around in the MCC (Sound Config) and in the Systems Settings - Multimedia/Audio Playback/Music (KDE) (or right click on the sound icon in the task bar - Audio Setup / Select Master Channel) without success.
mkv file (VLC or Dragon Player or SMPlayer) and I can't get any sound at all. Scenario 1: I play some Flash Player video in Firefox: No sound over HDMI but audio is working over the LINE OUT from the mainboard. I can't get any sound over HDMI and no sound at all from media players (.mkv for instance).
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