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[ubuntu] No sound on Radeon HD 5770 HDMI output

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linux-howto

http://ubuntuforums.org – I installed Ubuntu 12.04 and the onboard sound works. I installed the proprietary AMD drivers for the Radeon card and "aplay -l" seems to list the card: Code: **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC898 Analog [ALC898 Analog]   Subdevices: 0/1   Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 1: ALC898 Digital [ALC898 Digital]   Subdevices: 1/1   Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]   Subdevices: 1/1   Subdevice #0: subdevice #0 card 1: Generic (Hardware)