[paranoia] SCSI CD Problems - a workaround solution

[Lindsay Haisley]

I worked around the problem.  It turns out that the drive isn't a SCSI CD,
but an IDE CD mapped to a SCSI drive by the kernel with ide-scsi.o.

/dev/cdrom was a symlink to /dev/cdrom0 which was a symlink to /dev/scd0. 
This is set up by the discover program, which I apparently loaded or updated
on my system within the past few months.  discover decides to use the
ide-scsi module and set the drive up as a SCSI drive on the basis of the
module being available.  Apparently cdparanoia doesn't deal gracefully with
a virtual SCSI CD set up by the kernel.  Don't know if this is a kernel
problem or a cdparanoia problem.  I don't need the ide-scsi module and it
was not previously loaded.

The problem can be band-aided by excluding ide-scsi from management by
discover by including the following line in /etc/discover.conf

kip ide-scsi

discover will set up the first link noted above, but dev/cdrom0 will be a
symlink to /dev/hdx (x is the CD drive IDE sequence number) instead of
/dev/scdx and ide-scsi won't be loaded by default.

The ide-scsi module (or compiled kernel facility) is needed for cdrecord, I
understand, so this might present an issue for some people, requiring
dynamic loading and unloading of the module.  As noted in my original post,
other programs deal well enough with the CD drive as a virtual SCSI device,
but cdparanoia doesn't, so this is apparently someone's bug, either the
kernel developers or the cdparanoia developers.

<p>Thus spake Lindsay Haisley on Wed, Feb 12, 2003 at 03:16:48PM CST
> I have a system here with a SCSI CDROM that used to work fine with
> cdparanoia.  For some reason it's stopped working, possibly as a result of a
> kernel upgrade, but really I have no way of telling.  Nothing else has
> really changed on the system which might affect this, as far as I can tell.
> 
> $ cdparanoia -v -d /dev/scd0 1 /tmp/foo
> cdparanoia III release 9.7 (December 13, 1999)
> (C) 1999 Monty <monty at xiph.org> and Xiphophorus
> 
> Report bugs to paranoia at xiph.org
> http://www.xiph.org/paranoia/
> 
> Checking /dev/scd0 for cdrom...
>         Testing /dev/scd0 for cooked ioctl() interface
>                 /dev/scd0 is not a cooked ioctl CDROM.
>         Testing /dev/scd0 for SCSI interface
>                 No generic SCSI device found to match CDROM device /dev/scd0
> 
> (same thing happens with release 9.8)
> 
> $ xmcd -dev /dev/scd0
> 
> ... works as expected and plays CDs, so the CD drive works OK.
> 
> xmms will also play CD tracks, and it also works properly.
> 
> I'm running Debian GNU/Linux with Linux kernel 2.4.20.  Kernel modules
> sr_mod.o and cdrom.o are loaded.
> 
> I use cdparanoia with mp3c for my business, and have a customer waiting for
> me to generate mp3 files from a CD she sent me.  Any help with this problem
> would be greatly appreciated!
> 
> -- 
> Lindsay Haisley       | "Everything works    |     PGP public key
> FMP Computer Services |       if you let it" |      available at
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> http://www.fmp.com    |                      |
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-- 
Lindsay Haisley       | "Everything works    |     PGP public key
FMP Computer Services |       if you let it" |      available at
512-259-1190          |    (The Roadie)      | <http://www.fmp.com/pubkeys>
http://www.fmp.com    |                      |
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