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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?
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During the boot process Adaptec HBAs typically offer you an option like Ctrl-A to get into the HBA's BIOS. Did you do that? Do you see the scanner at that level?
Haven't worked with scanners myself but that seems a good troubleshooting step.
Also after Linux boots you should be able to get details of the adaptec by looking under /proc/scsi for your adapter. (For every Adaptec I've used the entry under /proc/scsi is aic7xxx. This would be a subdirectory. Under that the number items can be cat'ed to see details. If this is the only SCSI in your system the number should 0.)