Sorry I didn't notice this thread earlier! A couple of us have been investigating this exact problem on another thread:
http://www.linuxquestions.org/questi...roblem-702994/
Bottom line, if your computer has this problem you can't complete a normal Slackware 12.2 installation. However, on my Dell Inspiron 2650 I was able to compile a 12.2 kernel that omits the SCSI low level drivers, and that custom kernel boots correctly and appears to run properly.
Susceptible computers noted so far:
Dell Inspiron 2500
Dell Inspiron 2650
Toshiba Satellite 3000 (precise model unknown)