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I did a clean install of Ubuntu 11.04 and everything went fine.
The sound was working without a problem with the on-board device Azalia (Intel HDA) from the ASUS Crosshair IV Formula motherboard.

Then, i installed the proprietary drivers for the AMD Radeon HD 6870 through this guide.
Now the sound is gone.

If i go to Sound Preferences, on the Output options i see two devices for sound output:

  • Internal Audio Analog Stereo (selected)
  • Barts HDMI Audio [Radeon HD 6800 Series]

Is there anything i can do?
If you need any more information, let me know.

Thanks!

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Same problem here. It's actually not after Catalyst install, but after first reboot. Can you confirm? Also this question might be duplicate of that one: askubuntu.com/questions/36858/… –  skfd May 2 '11 at 1:10
    
You are right @skfd! Both times the first reboot was to install the drivers, but they are completely unrelated. –  baratox May 4 '11 at 22:41

1 Answer 1

up vote 3 down vote accepted

Fixed it by adding options snd-hda-intel model=generic to the end of /etc/modprobe.d/alsa-base.conf and rebooting.

From: Fix HDA Intel (Realtek ALC887) No Sound Issue In Ubuntu 10.10 Maverick Meerkat

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