Bug#416388: linux-source-2.6.18: Wodim hangs and system may freeze
> From: John Talbut
> Newsgroups: gmane.linux.debian.devel.kernel
> Subject: Bug#416388: linux-source-2.6.18: Wodim hangs and system may freeze
> Date: Tue, 27 Mar 2007 15:41:42 +0100
>
> Package: linux-source-2.6.18
> Version: 2.6.18.dfsg.1-11
> Severity: important
>
>
> This is similar to 265747, which was determined to be a kernel problem, but this
> is happening with a different kernel version, different package (wodim) and
> different drive.
>
> I insert a blank CD-R disk in the drive.
>
> I run:
> wodim dev=/dev/cdrw /home/john/debian-testing-i386-CD-1.iso
If was broken for me since sarge to start with.
As you may read on that reports, the problem is DMA. Did you try to
switch off it on your opto-drive (hdparm -d0 /dev/cd-rw)? I always
do this, before writing anything optical.
If this helps, then kernel developers don't care much to debug and test
it. Maybe because DMA is not important for this things. I doubt recording
speed may be safely more than x16 (=2.4M/s), due to quality of storage.
Thus, implementing things like DMA tests and using it in cdrecord is
a bad idea, IMHO.
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