[alsa-devel] Backported sbxfi driver (UNTESTED!)

Takashi Iwai tiwai at suse.de
Wed Oct 15 08:38:49 CEST 2008

At Tue, 14 Oct 2008 15:24:22 +0400,
The Source wrote:
> By the way, note, that not rate may cause oops but number of channles 
> for example (wav that causes oops has mono mode and the one that just 
> plays silently - stereo. Also the oops sample is 16bit, silent one is 
> 24bit).

This is an important information.  The driver basically supports only
16bit stereo samples natively.  The others are covered by alsa-lib,
and this involves with the mmap mode.

But I still wonder why 16bit mode.

OK, the below is *THE* test I'd like ask you guys to try first.

- Build the driver with --with-debug=detect option
- Load the driver with debug=2 module option
- Prepare a WAV file with 96kHz 16bit stereo, e.g. converted via sox
- Raise the Master volume to the max
- Run "aplay this.wav"

At *each* run, check your kernel message.  If you get Oops, copy the
whole log immediately.

- If you get a DMA error or so in the kernel message, try to define
  XXX_SYSTEM_TIMER in sbxfi.c, rebuild and reinstall the driver.
  Run the same test.

- If still any serious problem, load the module with debug=3 option,
  and get the whole kernel message with full register accesses.



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