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My Ubuntu 12.10 system on Lenovo Ideacenter Q180 sees only the HDMI soundcard, but not the onboard one. How can I fix this?

lshw output:

Audio device
product: Caicos HDMI Audio [Radeon HD 6400 Series] [1002:AA98]
vendor: Advanced Micro Devices [AMD] nee ATI [1002]
bus info: pci@0000:04:00.1
version: 00
width: 64 bits
clock: 33MHz
    Power Management,
    PCI Express,
    Message Signalled Interrupts,
    bus mastering,
    PCI capabilities listing
    driver: snd_hda_intel
    latency: 0
    irq: 51
    memory: d0040000-d0043fff


sudo aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
    Subdevices: 0/1


sudo lspci | grep Aud
04:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Caicos HDMI Audio [Radeon HD 6400 Series]
    Subdevice #0: subdevice #0
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It turns out the Audio is handled by the video driver. The fglrx video driver has to be installed. How this is done was answered in another question. In my case I actually installed "fglrx-experimental-9" package, because even now when sound was working youtube videos were not fluent.

Finally, to get everything working really smothly as a media center pc I recommend installing XBMC.

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