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dma error philips with dvdrw1645k

i have installed a dvd burner philips dvdrw1645k and have various problems
writing/reading dvd's and cd's.
Writing dvd's at 12x speed sometimes works without any problems. Sometimes i
get errors like:

May 24 07:01:46 samson kernel: hdc: irq timeout: status=0xd0 { Busy }
May 24 07:01:46 samson kernel: ide: failed opcode was: unknown
May 24 07:01:46 samson kernel: hdc: ATAPI reset complete

After that dma is disabled and writing is done at 1x speed or even fails.
Here you can see k3b output of a failed write: http://pauls.ch/k3b.log.txt

Reading cd's only works when dma is turned off. When dma is enabled, i get
the following errors:

gerd@samson:~$  mount /cdrom
gerd@samson:~$ file /cdrom/fam11.avi 
/cdrom/fam11.avi: ERROR: cannot read `/cdrom/fam11.avi' (Input/output error)
dmesg shows:
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A
hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error }
hdc: cdrom_decode_status: error=0x44 { AbortedCommand LastFailedSense=0x04 }
ide: failed opcode was: unknown
hdc: media error (bad sector): status=0x51 { DriveReady SeekComplete Error }
hdc: media error (bad sector): error=0x34 { AbortedCommand
LastFailedSense=0x03 }
dmesg end

When i disable dma:
gerd@samson:~$ umount /cdrom
gerd@samson:~$ su
samson:/home/gerd# hdparm -d 0 /dev/hdc

 setting using_dma to 0 (off)
 using_dma    =  0 (off)
samson:/home/gerd# exit
gerd@samson:~$ mount /cdrom
gerd@samson:~$ file /cdrom/fam11.avi 
/cdrom/fam11.avi: RIFF (little-endian) data, AVI, 576 x 432, 25.00 fps,
video: XviD, audio: MPEG-1 Layer 3 (stereo, 48000 Hz)

The cd is O.K., it can be read on any other pc. I also have these problems
with bought cd's.

I'm using debian kernel-source-2.6.11. My /proc/config.gz can be seen here:

I would appreciate any hint.


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