DVD Problem

[Martin Fluch <fluch@rock.it.helsinki.fi>]

Hi!

I have a small problem with my newly aquired DVD/CDRW combo drive. I tried 
to google for it already but despite getting lots of hits I did not find 
any usefull answer sofar.

Reading/writing CD's works fine, but as soon as I insert a DVD into the 
drive, the kernel starts right away (even without any userspace programm 
accessing the drive) to report:

   hdc: packet command error: status=0x51 { DriveReady SeekComplete Error }
   hdc: packet command error: error=0x50
   hdc: packet command error: status=0x51 { DriveReady SeekComplete Error }
   hdc: packet command error: error=0x50
   ...

Every second one pair of those messages, on and on until I remove the DVD 
again. Still, it is NO problem to play the DVD. What is the meaning of 
this error message? And how to get rid of it?

The drive in question is a QuantumStorage SBW-241, I use it in my IBM 
ThinkPad T20.

I use a stock 2.6.7 kernel, during start up the kernel reports:

   ...
   hda: IBM-DJSA-220, ATA DISK drive
   ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
   hdc: QSI CD-RW/DVD-ROM SBW-241, ATAPI CD/DVD-ROM drive
   ide1 at 0x170-0x177,0x376 on irq 15
   hda: max request size: 128KiB
   hda: 39070080 sectors (20003 MB) w/1874KiB Cache, CHS=38760/16/63, UDMA(33)
    hda: hda1 hda2 < hda5 hda6 hda7 hda8 hda9 hda10 >
   hdc: ATAPI 24X DVD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
   Uniform CD-ROM driver Revision: 3.20
   ...

Hdparm reports

   IO_support   =  0 (default 16-bit)
   unmaskirq    =  0 (off)
   using_dma    =  1 (on)
   keepsettings =  0 (off)
   readonly     =  1 (on)
   readahead    = 256 (on)

If successfully set the region code to 2 (with "regionset 2"), but this 
didn't change anything.

Any clue? Anything I missed?

- Martin