Using google I found:
http://www.mail-archive.com/alsa-devel@lists.sourceforge.net/msg09647.html
saying:
"so i looked up the pci register fix put the line "install snd-au8830 
/sbin/setpci -d '12eb:*' 40.B=ff ; insmod snd-au8830" in my modules.conf and 
everything worked fine."
I'm not sure if this really works, because I had no /etc/modules.conf . Now I 
do (-;

** Description changed:

  This bug already existed in Dapper, Edgy and now in the Feisty alpha, too.
  The sound card is a Aureal Vortex and the used driver (I think it's the 
driver - could be model name, bur I don't think so) is au8820.
  BUG:
  A programm using sound is running, after it's closed no other app will be 
able to send sound to the driver.
  
  DMESG tells this: I think this is the bug, because this appears each time it 
bugs...
  [  397.354794] Vortex: vortex_fifo_setadbctrl fail
  
  To reproduze try playing a flv 'stolen' from youtube.com with mplayer
  use arrows keys a few times and soon sound driver should crash (-;
  
  ProblemType: Bug
  Architecture: i386
  Date: Fri Mar 16 20:58:11 2007
  DistroRelease: Ubuntu 7.04
  Uname: Linux Unten 2.6.20-10-386 #2 Sun Mar 11 23:59:49 UTC 2007 i686 
GNU/Linux
+ 
+ EDIT:
+ tail -2 /proc/asound/oss/sndstat says
+ Mixers:
+ 0: SigmaTel STAC9704
+ 
+ amixer says:
+ Simple mixer control 'Master',0
+   Capabilities: pvolume pswitch pswitch-joined
+   Playback channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Mono:
+   Front Left: Playback 31 [100%] [0.00dB] [on]
+   Front Right: Playback 31 [100%] [0.00dB] [on]
+ Simple mixer control 'Master Mono',0
+   Capabilities: pvolume pvolume-joined pswitch pswitch-joined
+   Playback channels: Mono
+   Limits: Playback 0 - 31
+   Mono: Playback 31 [100%] [0.00dB] [on]
+ Simple mixer control '3D Control - Center',0
+   Capabilities: volume volume-joined
+   Playback channels: Mono
+   Capture channels: Mono
+   Limits: 0 - 15
+   Mono: 9 [60%]
+ Simple mixer control '3D Control - Depth',0
+   Capabilities: volume volume-joined
+   Playback channels: Mono
+   Capture channels: Mono
+   Limits: 0 - 15
+   Mono: 15 [100%]
+ Simple mixer control '3D Control - Switch',0
+   Capabilities: pswitch pswitch-joined
+   Playback channels: Mono
+   Mono: Playback [off]
+ Simple mixer control 'PCM',0
+   Capabilities: pvolume pswitch pswitch-joined
+   Playback channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Mono:
+   Front Left: Playback 31 [100%] [12.00dB] [on]
+   Front Right: Playback 31 [100%] [12.00dB] [on]
+ Simple mixer control 'PCM Out Path & Mute',0
+   Capabilities: enum
+   Items: 'pre 3D' 'post 3D'
+   Item0: 'pre 3D'
+ Simple mixer control 'Line',0
+   Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-exclusive
+   Capture exclusive group: 0
+   Playback channels: Front Left - Front Right
+   Capture channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
+   Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]
+ Simple mixer control 'CD',0
+   Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-exclusive
+   Capture exclusive group: 0
+   Playback channels: Front Left - Front Right
+   Capture channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
+   Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]
+ Simple mixer control 'Mic',0
+   Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch 
cswitch-exclusive
+   Capture exclusive group: 0
+   Playback channels: Mono
+   Capture channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Mono: Playback 0 [0%] [-34.50dB] [off]
+   Front Left: Capture [on]
+   Front Right: Capture [on]
+ Simple mixer control 'Mic Boost (+20dB)',0
+   Capabilities: pswitch pswitch-joined
+   Playback channels: Mono
+   Mono: Playback [off]
+ Simple mixer control 'Mic Select',0
+   Capabilities: enum
+   Items: 'Mic1' 'Mic2'
+   Item0: 'Mic1'
+ Simple mixer control 'Video',0
+   Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-exclusive
+   Capture exclusive group: 0
+   Playback channels: Front Left - Front Right
+   Capture channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
+   Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]
+ Simple mixer control 'Phone',0
+   Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch 
cswitch-exclusive
+   Capture exclusive group: 0
+   Playback channels: Mono
+   Capture channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Mono: Playback 0 [0%] [-34.50dB] [off]
+   Front Left: Capture [off]
+   Front Right: Capture [off]
+ Simple mixer control 'PC Speaker',0
+   Capabilities: pvolume pvolume-joined pswitch pswitch-joined
+   Playback channels: Mono
+   Limits: Playback 0 - 15
+   Mono: Playback 0 [0%] [-45.00dB] [off]
+ Simple mixer control 'Aux',0
+   Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-exclusive
+   Capture exclusive group: 0
+   Playback channels: Front Left - Front Right
+   Capture channels: Front Left - Front Right
+   Limits: Playback 0 - 31
+   Front Left: Playback 19 [61%] [-6.00dB] [off] Capture [off]
+   Front Right: Playback 19 [61%] [-6.00dB] [off] Capture [off]
+ Simple mixer control 'Mono Output Select',0
+   Capabilities: enum
+   Items: 'Mix' 'Mic'
+   Item0: 'Mix'
+ Simple mixer control 'Capture',0
+   Capabilities: cvolume cswitch cswitch-joined
+   Capture channels: Front Left - Front Right
+   Limits: Capture 0 - 15
+   Front Left: Capture 0 [0%] [0.00dB] [on]
+   Front Right: Capture 0 [0%] [0.00dB] [on]
+ Simple mixer control 'Mix',0
+   Capabilities: cswitch cswitch-exclusive
+   Capture exclusive group: 0
+   Capture channels: Front Left - Front Right
+   Front Left: Capture [off]
+   Front Right: Capture [off]
+ Simple mixer control 'Mix Mono',0
+   Capabilities: cswitch cswitch-exclusive
+   Capture exclusive group: 0
+   Capture channels: Front Left - Front Right
+   Front Left: Capture [off]
+   Front Right: Capture [off]
+ Simple mixer control 'External Amplifier',0
+   Capabilities: pswitch pswitch-joined
+   Playback channels: Mono
+   Mono: Playback [on]
+ 
+ lspci -nv says:
+ 00:0d.0 0401: 12eb:0001 (rev 02)
+         Subsystem: 122d:1002
+         Flags: medium devsel, IRQ 20
+         Memory at dffc0000 (32-bit, non-prefetchable) [size=128K]
+         I/O ports at e800 [size=8]
+         I/O ports at e400 [size=8]
+         Capabilities: [dc] Power Management version 1
+ should be the sound card, because lspci without -nv says about 00:0d:0:  
Multimedia audio controller: Aureal Semiconductor Vortex 1 (rev 02)
+ 
+ asoundconf list says:
+ Names of available sound cards:
+ au8820
+ 
+ cat /etc/asound.conf ~/.asoundrc* no such file or directory.
+ 
+ cat /proc/interupts says:
+   0:     612346   IO-APIC-edge      timer
+   1:       4483   IO-APIC-edge      i8042
+   6:          5   IO-APIC-edge      floppy
+   7:          0   IO-APIC-edge      parport0
+   8:          3   IO-APIC-edge      rtc
+   9:          0   IO-APIC-fasteoi   acpi
+  12:          4   IO-APIC-edge      i8042
+  14:      23513   IO-APIC-edge      ide0
+  15:      21523   IO-APIC-edge      ide1
+  16:       2820   IO-APIC-fasteoi   hp100
+  17:      48907   IO-APIC-fasteoi   uhci_hcd:usb1, uhci_hcd:usb2, 
uhci_hcd:usb3, ehci_hcd:usb4
+  18:          0   IO-APIC-fasteoi   eth1
+  19:     217936   IO-APIC-fasteoi   nvidia
+  20:       1119   IO-APIC-fasteoi   au8820
+ NMI:          0

-- 
sound driver crashes sometimes while playing sound
https://launchpad.net/bugs/92895

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