Since a recent ALSA upgrade in rawhide quite a few audio device strings became unavailable on my setup. That means that analog output and HDMI output are no longer detected by PulseAudio, rendering it mostly useless.

$ aplay -D plug:front:Aureon51MkII -f CD < /dev/urandom 
ALSA lib conf.c:4626:(snd_config_expand) Expand error (walk): File exists
ALSA lib confmisc.c:1286:(snd_func_refer) Unable to find definition 'cards.USB-Audio.pcm.front.0:CARD=Aureon51MkII'
ALSA lib conf.c:4153:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:4632:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM front:Aureon51MkII
aplay: main:608: audio open error: No such file or directory

$ aplay -D plug:hdmi:HDMI -f CD < /dev/urandom 
ALSA lib conf.c:4626:(snd_config_expand) Expand error (walk): File exists
ALSA lib confmisc.c:1286:(snd_func_refer) Unable to find definition 'cards.HDA-Intel.pcm.hdmi.0:CARD=HDMI,AES0=4,AES1=130,AES2=0,AES3=2'
ALSA lib conf.c:4153:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:4632:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM hdmi:HDMI
aplay: main:608: audio open error: No such file or directory


$ cat /proc/asound/cards
 0 [U0x46d0x9a4    ]: USB-Audio - USB Device 0x46d:0x9a4
                      USB Device 0x46d:0x9a4 at usb-0000:00:1a.7-3, high speed
 1 [Bt878          ]: Bt87x - Brooktree Bt878
                      Brooktree Bt878 at 0xe8201000, irq 19
 2 [AudioPCI       ]: ENS1371 - Ensoniq AudioPCI
                      Ensoniq AudioPCI ENS1371 at 0xd000, irq 20
 3 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xe8300000 irq 22
 4 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xe5010000 irq 17
 5 [Aureon51MkII   ]: USB-Audio - Aureon5.1MkII
                      TerraTec Aureon5.1MkII at usb-0000:00:1a.1-2, full speed
 6 [Speaker        ]: USB-Audio - Logitech USB Speaker
                      Logitech Logitech USB Speaker at usb-0000:00:1d.1-2, full speed

alsa-lib-1.0.21-1.fc12.x86_64