Problems with reading DVD using 2.6.21.5

[Manuel Reimer]

Hello,

today I've tried to install Slackware 12.0

As the installer just "skipped" some install steps, I tried to find the 
error.

The problem seems to be unreadable parts on the DVD:

http://pastebin.com/f381e8a88

But the DVD is OK. I've checked the MD5sum directly from disc on the 
same system using the same DVD drive.

dmesg says:

http://pastebin.com/f63c5c389

The kernel, used on the Slackware setup disk, uses SMP, but my hardware 
doesn't support this (get error on dmesg). May this (SMP kernel on 
non-SMP system) cause such bugs?

Is this a known bug? How could code, which breaks DVD access, get into 
stable 2.6.21.5?

Thanks very much in advance

CU

Manuel

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