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When booting Ubuntu 12.04, I have sound coming from my speakers through HDMI, except the start up sound (not a big deal). My card is listed in the sound settings. If I switch inputs on my monitor, the card (Radeon HD 5450) disappears.

I have tried both the proprietary drivers and open source drivers and nothing seems to fix it. As a side note my video settings don't stick after changing them. IE. Pixel format, GPU scaling, etc. I have this monitor connected with HDMI and also have a VGA cable connected to run a KVM switch, but 99% of the time run with the HDMI connection.

Anyone have any ideas?

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Have the same problem too. Same hardware – ECII May 20 '12 at 14:38
Try killall pulseaudio ( – Eugen Labun Dec 26 '12 at 17:16

Run this command in terminal : alsamixer

and check if the master-sound is set to mute. (oo is unmute and mm is mute)

enter image description here

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Master volume is set to 70. HDMI card still disappears when switching inputs on the monitor. – DiamondKing1976 May 5 '12 at 23:10

protected by Community May 7 '12 at 13:32

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