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Recent issue with cd drive on PB 12" (matshita)



Dear all,

last night I tried to burn a CD on my PB12" running Sarge (testing) and it
was not recognized by cdrecord whereas it used to work seamlessly before.
Trying to mount it, mount tells me that /dev/cdrom is not a valid block
device (both reading and writing worked perfectly well one week ago). I'm
using ide-scsi emulation. My kernel is a recompiled (but not recently)
2.4.23. Reading and Writing still work under MacOS X.

When I try to mount the cdrom for reading, mount says :

- as root on the command line (sudo mount -t iso9660 /dev/scd0 /cdrom)

mount: /dev/scd0 is not a valid block device

- and the same when mounting as a user using fstab entries = mount
/dev/cdrom :

mount: /dev/cdrom is not a valid block device

I have not changed anything in the kernel (no compilation since several
weeks) - yaboot - fstab since then. When I read dmesg output, I can see
these lines :

...
Probing IDE interface ide0...
hda: MATSHITACD-RW CW-8122, ATAPI CD/DVD-ROM drive
hda: Enabling MultiWord DMA 2
Probing IDE interface ide1...
hdc: TOSHIBA MK4021GAS, ATA DISK drive
hdc: Enabling Ultra DMA 5
ide0 at 0xec203000-0xec203007,0xec203160 on irq 24
ide1 at 0xec209000-0xec209007,0xec209160 on irq 39
hdc: attached ide-disk driver.
hdc: 78140160 sectors (40008 MB), CHS=77520/16/63, UDMA(100)
Partition check:
 hdc: [mac] hdc1 hdc2 hdc3 hdc4 hdc5 hdc6 hdc7 hdc8 hdc9 hdc10 hdc11 hdc12
hdc13
 hdc14
SCSI subsystem driver Revision: 1.00
mesh: configured for synchronous 5 MB/s
kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2
...

whereas on Jan 15, this latest line (kmod: failed to exec...) did not
appear :

Probing IDE interface ide0...
hda: MATSHITACD-RW CW-8122, ATAPI CD/DVD-ROM drive
hda: Enabling MultiWord DMA 2
Probing IDE interface ide1...
hdc: TOSHIBA MK4021GAS, ATA DISK drive
hdc: Enabling Ultra DMA 5
ide0 at 0xec203000-0xec203007,0xec203160 on irq 24
ide1 at 0xec209000-0xec209007,0xec209160 on irq 39
hdc: attached ide-disk driver.
hdc: 78140160 sectors (40008 MB), CHS=77520/16/63, UDMA(100)
Partition check:
hdc: [mac] hdc1 hdc2 hdc3 hdc4 ...
SCSI subsystem driver Revision: 1.00
mesh: configured for synchronous 5 MB/s
...

The line from kmod seems to indicate a problem with SCSI in kernel modules
isn't it ? But I have not recompiled my kernel (2.4.23) and modules
recently.

Has any one encountered such problems in the last few days ? I can't
remember having seen an update concerning the CD reader-writer, or
anything related when last updating (which I do quite frequently).

As a matter of fact, df tells me there is a /dev/shm 'tmpfs' filesystem
mounted whereas I do not remember having seen this before neither. And I
do not know what it is exactly but perhaps there is no link at all.

Filesystem            Size  Used Avail Use% Mounted on
...
tmpfs                 314M     0  314M   0% /dev/shm



Thanks very much for your help.
Olivier.

-- 
  Olivier Crouzet
  acoustique, acquisition, interprétation - JE 2220
  Université de Nantes



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