cdrecord error

["Jeremy Brooks" <jeremyb@whirljack.net>]

I've got a Dell X300 (laptop) running kernel 2.6.10 and sarge.  It has an
external usb CD recorder.  When the CDR is plugged in, the following
devices appear:
/dev/cdrom -> scd0
/dev/sr0 -> scd0

scd0 looks like this:
brw-rw----  1 root cdrom 11, 0 2005-01-20 15:51 /dev/scd0

so far so good.  I can read from the device, and I can burn using Nautilus
CD Writer.  No problem.

But, anything that uses cdrecord (k3b, gcombust, or just command line
cdrecors) bombs.  A scanbus looks like this:

jeremyb@talisker:~$ cdrecord dev=ATAPI: -scanbus
Cdrecord-Clone 2.01a34 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg
Schilling
NOTE: this version of cdrecord is an inofficial (modified) release of
cdrecord
      and thus may have bugs that are not present in the original version.
      Please send bug reports and support requests to
<cdrtools@packages.debian.org>.
      The original author should not be bothered with problems of this
version.

scsidev: 'ATAPI:'
devname: 'ATAPI'
scsibus: -1 target: -1 lun: -1
Warning: Using ATA Packet interface.
Warning: The related Linux kernel interface code seems to be unmaintained.
Warning: There is absolutely NO DMA, operations thus are slow.
cdrecord: ERROR: unknow subsystem (scd0) in (/dev/sr0)
cdrecord: No such file or directory. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
cdrecord:
cdrecord: For more information, install the cdrtools-doc
cdrecord: package and read /usr/share/doc/cdrecord/README.ATAPI.setup .

That "unknow subsystem" error look suspicious.  I've googled, but I am
stumped.


here's lsmod:
Module                  Size  Used by
nls_cp437               5632  0
isofs                  36792  0
zlib_inflate           18176  1 isofs
usb_storage            70208  0
pcmcia                 22660  4
ipx                    29676  0
p8022                   2240  1 ipx
psnap                   4036  1 ipx
llc                     7700  2 p8022,psnap
parport_pc             37828  0
lp                     11304  0
parport                37192  2 parport_pc,lp
8250_pci               18432  0
8250                   24676  1 8250_pci
serial_core            23232  1 8250
snd_intel8x0           33312  2
snd_ac97_codec         77152  1 snd_intel8x0
snd_pcm_oss            54244  0
snd_mixer_oss          20352  2 snd_pcm_oss
snd_pcm                98312  3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss
snd_timer              25860  1 snd_pcm
snd                    54628  8
snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
snd_page_alloc          9988  2 snd_intel8x0,snd_pcm
joydev                  9664  0
evdev                   9344  1
eth1394                21192  0
usbhid                 32640  0
ehci_hcd               31492  0
ohci1394               35332  0
yenta_socket           22080  0
pcmcia_core            53516  2 pcmcia,yenta_socket
sr_mod                 17636  0
sbp2                   24392  0
scsi_mod              129792  3 usb_storage,sr_mod,sbp2
ieee1394              321720  3 eth1394,ohci1394,sbp2
unix                   28916  572


And here's the relavant portion of /var/log/messages when the device is
connected:
Jan 20 15:49:54 localhost kernel: usb 4-1: new high speed USB device using
ehci_hcd and address 6
Jan 20 15:49:54 localhost kernel: scsi3 : SCSI emulation for USB Mass
Storage devices
Jan 20 15:49:55 localhost usb.agent[5258]:      usb-storage: already loaded
Jan 20 15:49:59 localhost kernel:   Vendor: SAMSUNG   Model: CDRW/DVD
SN-324S  Rev: U303
Jan 20 15:49:59 localhost kernel:   Type:   CD-ROM                        
    ANSI SCSI revision: 00
Jan 20 15:49:59 localhost kernel: sr0: scsi3-mmc drive: 5x/24x writer
cd/rw xa/form2 cdda tray
Jan 20 15:49:59 localhost scsi.agent[5396]: cdrom at
/devices/pci0000:00/0000:00:1d.7/usb4/4-1/4-1:1.0/host3/target3:0:0/3:0:0:0


Any ideas?