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From
SubjectRe: sbpcd woes under 2.0.10
Date
Rob Riggs (rriggs@tesser.com) wrote:
: I have 2 cdroms attached to my SB16:

: sbpcd-0 [02]: Drive 0 (ID=0): CD-55 (1011) at 0x230 (type 1)
: sbpcd-1 [03]: Drive 1 (ID=1): CR-563 (0.75) at 0x230 (type 1)

: I got about 13 of these after trying to 'ls /cdrom1' (drive 0)
: while I had xmcd playing a music CD in drive 1.
: sbpcd-1 [31]: sbpcd_open: ResponseStatus timed out (-401).

Yes, known.
It is impossible currently (at least for me) to synchronize data
requests with the wild, rigorous storm of audio IOCTL requests of
those all-ressource-gathering-and-wasting audio CD programs (this
is not meant to discredit xmcd). You simply can't do anything else
on the drive cable if one of those big audio CD packages is running.

Solution #1: use a separate interface card for the drive you
are playing audio with.
It is safe to use one interface card for up to 4 data drives, and
an additional interface card for (each of the) drive(s) you want
to use for audio CD functions simultaneously.

Solution #2: use the cdtester utility for the audio part (appendix
of linux/Documentation/cdrom/sbpcd); it is only useful for playing
audio - f.e., trying to monitor the current audio position could
cause the same hassle again.

Cheers -e
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