Something

ERROR: 

ALSA lib pcm_dmix.c:1010:(snd_pcm_dmix_open) unable to open slave

01:00.0 VGA compatible controller: ATI Technologies Inc RV710 [Radeon HD 4350]
        Subsystem: Diamond Multimedia Systems Device e990
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at fdde0000 (64-bit, non-prefetchable) [size=64K]
        I/O ports at ee00 [size=256]
        Expansion ROM at fddc0000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
        Capabilities: [100] Vendor Specific Information <?>
        Kernel driver in use: fglrx_pci
        Kernel modules: fglrx, radeon

01:00.1 Audio device: ATI Technologies Inc RV710/730
        Subsystem: Diamond Multimedia Systems Device aa38
        Flags: bus master, fast devsel, latency 0, IRQ 19
        Memory at fddfc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
        Capabilities: [100] Vendor Specific Information <?>
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel




root@XBMCLive:~# aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
hdmi:CARD=HDMI
    HDA ATI HDMI, ATI HDMI
    HDMI Audio Output