via_audio: ignoring drain playback error

Hello,

I cannot get any output out of the speakers.:(
Module loaded, cat sample.au, no outout

kernel 2.4.18:
Via 686a audio driver 1.9.1
ac97_codec: AC97 Audio codec, id: 0x414c:0x4710
(ALC200/200P)
via82cxxx: board #1 at 0xE800, IRQ 5
...
via_audio: ignoring drain playback error -11
via_audio: ignoring drain playback error -11
#lspci -vv
00:11.5 Multimedia audio controller: VIA Technologies,
Inc. AC97 Audio Controller (rev 10)
Subsystem: Avance Logic Inc.: Unknown device 4710
Control: I/O+ Mem- BusMaster- SpecCycle-
MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr-
DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin C routed to IRQ 5
Region 0: I/O ports at e800 [size=256]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2-
AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
#lspci -n
00:11.5 Class 0401: 1106:3059 (rev 10)
#lsmod
via82cxxx_audio 17856 0
uart401 6080 0 [via82cxxx_audio]
ac97_codec 9376 0 [via82cxxx_audio]
sound 52300 0 [via82cxxx_audio uart401]
soundcore 3556 4 [via82cxxx_audio sound]

Do you have any idea whats the problem?

thx.