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Subjectvia82cxxx_audio bug in kernel-2.4.18

Using 2.4.18 kernel of mandrake-8.2 . Sound is played ok until
'dmesg' shows these error messages:

Assertion failed! chan->is_active ==
sg_active(chan->iobase),via82cxxx_audio.c,via_chan_maybe_start,line=1198
Assertion failed! chan->is_active ==
sg_active(chan->iobase),via82cxxx_audio.c,via_chan_maybe_start,line=1198
Assertion failed! chan->is_active ==
sg_active(chan->iobase),via82cxxx_audio.c,via_chan_maybe_start,line=1198
via_audio: ignoring drain playback error -512
Assertion failed! chan->is_active ==
sg_active(chan->iobase),via82cxxx_audio.c,via_chan_maybe_start,line=1198
via_audio: ignoring drain playback error -512

The lsmod output after the error shows nothing strange:

Module Size Used by Not tainted
via82cxxx_audio 18144 0
uart401 6336 0 [via82cxxx_audio]
ac97_codec 9568 0 [via82cxxx_audio]
sound 57292 0 [via82cxxx_audio uart401]
soundcore 4068 5 [via82cxxx_audio sound]

After this error no sound is played. Unload and reload of via82cxxx_audio
makes no difference. Only way out is reboot.

Output of 'via-audio-diag -eps':

via-audio-diag.c:v1.00 05/06/2000 Jeff Garzik (jgarzik@mandrakesoft.com)
Index #1: Found a via 686a audio adapter at 0xcc00.
AC97 RESET = 0x6D50 (27984)
AC97 MASTER_VOL_STEREO = 0x0A0A (2570)
AC97 HEADPHONE_VOL = 0x0A0A (2570)
AC97 MASTER_VOL_MONO = 0x000A (10)
AC97 MASTER_TONE = 0x0000 (0)
AC97 PCBEEP_VOL = 0x000A (10)
AC97 PHONE_VOL = 0x000A (10)
AC97 MIC_VOL = 0x8000 (32768)
AC97 LINEIN_VOL = 0x0A0A (2570)
AC97 CD_VOL = 0x0A0A (2570)
AC97 VIDEO_VOL = 0x0A0A (2570)
AC97 AUX_VOL = 0x0A0A (2570)
AC97 PCMOUT_VOL = 0x0000 (0)
AC97 RECORD_SELECT = 0x0000 (0)
AC97 RECORD_GAIN = 0x0A0A (2570)
AC97 RECORD_GAIN_MIC = 0x0000 (0)
AC97 GENERAL_PURPOSE = 0x0000 (0)
AC97 3D_CONTROL = 0x0000 (0)
AC97 MODEM_RATE = 0x0000 (0)
AC97 POWER_CONTROL = 0x000F (15)
AC97 EXTENDED_ID = 0x0201 (513)
AC97 EXTENDED_STATUS = 0x0001 (1)
AC97 PCM_FRONT_DAC_RATE = 0xBB80 (48000)
AC97 PCM_SURR_DAC_RATE = 0x0000 (0)
AC97 PCM_LFE_DAC_RATE = 0x0000 (0)
AC97 PCM_LR_ADC_RATE = 0xBB80 (48000)
AC97 PCM_MIC_ADC_RATE = 0x0000 (0)
AC97 CENTER_LFE_MASTER = 0x0000 (0)
AC97 SURROUND_MASTER = 0x0000 (0)
AC97 RESERVED_3A = 0x0000 (0)
SGD Playback : 88 00 B7 01EC1088 00000000
SGD Record : 00 00 00 00000000 00000000
SGD FM : 00 00 00 00000000 00000000
SGD Modem Playback : 00 00 00 00000000 00000000
SGD Modem Record : 00 00 00 00000000 00000000
SGD reg 0x80 = 0x00BA0000
SGD reg 0x84 = 0x00001000
SGD reg 0x88 = 0x00000000
SGD reg 0x8C = 0x00000000
PCI reg 0x10 = 0xD8000008
PCI reg 0x3C = 0x00
PCI reg 0x40 = 0x00
PCI reg 0x41 = 0x00
PCI reg 0x42 = 0x00
PCI reg 0x43 = 0x00
PCI reg 0x44 = 0x00
PCI reg 0x48 = 0x00

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