Hi,
this isn't a critical issue, but just in case someone is struggling
with the same problem.
Shortly put, with ALSA 0.5.12a, the cs4281 driver works ok (tested
with full-duplex operation in both native and OSS-emul modes). But
when upgrading to 0.9.x, card is not identified anymore. The error message
printed is:
--cut--
Jun 28 15:25:36 localhost kernel: ALSA ../alsa-kernel/pci/cs4281.c:675: AC'97 read
problem (ACSTS_VSTS), reg = 0x0
Jun 28 15:25:36 localhost kernel: ALSA ../alsa-kernel/pci/cs4281.c:675: AC'97 read
problem (ACSTS_VSTS), reg = 0x7c
Jun 28 15:25:36 localhost kernel: ALSA ../alsa-kernel/pci/cs4281.c:675: AC'97 read
problem (ACSTS_VSTS), reg = 0x7e
--cut--
And here's some hw info (IBM Thinkpad X21):
--cut--
00:0b.0 Multimedia audio controller: Cirrus Logic Crystal CS4281 PCI Audio (rev 01)
Subsystem: IBM: Unknown device 0183
Flags: bus master, medium devsel, latency 64, IRQ 11
Memory at f4012000 (32-bit, non-prefetchable) [size=4K]
Memory at f4000000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 2
--cut--
The AC97 codec is 'Cirrus Logic CS4297A rev B'. With the OSS-driver of
2.4.18 kernel, the playback works ok, but recording fails to wake up the
user-space (ie. only push-model use like 'cat </dev/dsp >/dev/dsp' works).
So currently ALSA 0.5.12a is the best driver for this specific chip-combo.
--
http://www.eca.cx
Audio software for Linux!
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