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Re: Mac mini, I/O Error on DVD read



On Wed, Nov 02, 2005 at 09:35:01PM +1100, Benjamin Herrenschmidt wrote:
> On Tue, 2005-11-01 at 22:52 +0100, Christophe Delage wrote:
> > Hi,
> > 
> > I recently bought a Mac Mini and quickly installed Debian Sarge on it.
> > However, the kernel do not seem to be able to read DVDs.
> > 
> > mini ~% uname -a                     
> > Linux mini 2.6.8-powerpc #1 Sun Mar 20 14:09:41 CET 2005 ppc GNU/Linux
> > mini ~% dd if=/dev/cdrom of=/dev/null
> > dd: reading `/dev/cdrom': Input/output error
> > 3792+0 records in
> > 3792+0 records out
> > 1941504 bytes transferred in 1.427759 seconds (1359826 bytes/sec)
> > 
> > And this shows up in /var/log/messages :
> > 
> > Nov  1 22:39:51 localhost kernel: hdb: command error: status=0x51 { DriveReady SeekComplete Error }
> > Nov  1 22:39:51 localhost kernel: hdb: command error: error=0x54
> > Nov  1 22:39:51 localhost kernel: end_request: I/O error, dev hdb, sector 4040
> 
> You aren't the only person to report problems with DVDs on recent Macs.
> I'm not sure what's up. Wether it's simply that you don't have libdvdcss
> installed to decrypt them, or there's something else dodgy going on with
> those Apple drives...

Guido and me once had this problem on our PowerBooks too. After playing a
DVD under MacOSX they went away and we had the impression that MacOSX
sets the country code on the DVD the first time a DVD is played. Once
the drive is initialized it works also under Linux.

But this not hard knowledge, just an observation. I don't really
remember if we had this problems only when we tried to watch a video or
if normal data DVDs lead to problems too.

HTH,

Wolfi
> 
> Ben.
> 
> 
> 
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