Problem with Matshita DVD drive

[Sergio Belkin]

I've recently acquired a Lenovo 3000 C200 that system detects it as
SCSI,  is a     DVD-RAM UJ-850, MATSHITA. I could play with no problems
the first time a DVD movie with libdvdcss2. But now, play no more
DVD's, it's as if libdvdcss2 was not installed. I've tried with
different DVDs, and problem it's the same. I tried also, with several
players: totem, kaffeine, vlc, mplayer, etc and problem remains.



Output of several files:

-/var/log/kern.log
Sep 16 12:41:51 sergio-laptop kernel: [  486.404000] Buffer I/O error
on device sr0, logical block 25899
Sep 16 12:41:51 sergio-laptop kernel: [  486.404000] Buffer I/O error
on device sr0, logical block 25900
Sep 16 12:41:51 sergio-laptop kernel: [  486.404000] Buffer I/O error
on device sr0, logical block 25901
Sep 16 12:41:51 sergio-laptop kernel: [  486.404000] Buffer I/O error
on device sr0, logical block 25902
Sep 16 12:41:51 sergio-laptop kernel: [  486.404000] Buffer I/O error
on device sr0, logical block 25903
Sep 16 12:41:51 sergio-laptop kernel: [  486.408000] end_request: I/O
error, dev sr0, sector 103584
Sep 16 12:41:51 sergio-laptop kernel: [  486.408000] Buffer I/O error
on device sr0, logical block 25896
Sep 16 12:41:51 sergio-laptop kernel: [  486.472000] end_request: I/O
error, dev sr0, sector 103584
Sep 16 12:41:51 sergio-laptop kernel: [  486.472000] Buffer I/O error
on device sr0, logical block 25896
Sep 16 12:41:51 sergio-laptop kernel: [  486.500000] end_request: I/O
error, dev sr0, sector 103584

/proc/scsi/scsi

Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
 Vendor: ATA      Model: TOSHIBA MK4034GS Rev: AH40
 Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
 Vendor: MATSHITA Model: DVD-RAM UJ-850   Rev: RB31
 Type:   CD-ROM                           ANSI SCSI revision: 05

*/etc/fstab (only line  about dvd drive)

/dev/scd0       /media/cdrom0   udf,iso9660 user,noauto     0       0


Before of thinking of a hardware problem, I want to discard a
misconfiguration. I've noted that BIOS refer to DVD drive as IDE.

I have installed libdvdcss2 as dpkg -l shows:

ii  libdvdcss2     1.2.9-2medibuntu2+build1 Library for accessing DVDs
like block device usind deCSS if needed

kernel version is  2.6.20-16-generic

I am a bit desperated, please could you help me to find a solution?

Note that I can see content of dvds but not play movies :(

Thanks in advance


-- 
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Sergio Belkin -