Quoting Andrew Greig ([email protected]):

> I have a SCSI scanner Epson GT7000, which I love, but occasionally in
> the past I may have turned it off, and as a consequence it is not
> detected at boot. In the old days when boot times were quick I would
> turn it on and reboot, but boot up time is not trivial in my Ubuntu
> system and so I am inquiring is there a way for the system to discover
> that the scanner is now turned on. Is there a way for the device to
> say "hey, I'm here now, let's play".  Or for the system to say, "well
> you weren't here at the start, but we'll let you play"

As the root user, try:

echo 1 > /sys/class/scsi_device/device/rescan

(Variations on that are covered at
https://thornelabs.net/2012/08/22/linux-rescan-scsi-bus.html, which
please also see.[1])

There is also a related script rescan-scsi-bus.sh traditionally said to
be furnished by something called sg3_utils, which I have not seen.)

(Disclaimer #1:  The first tip worked long ages ago, but I've not tested
it in a long time.)

(Disclaimer #2:  I am in a very different time zone where I am up a bit
past my bed time, ergo not ideally situated to fact-check before trying
to help.  Sorry, good sir.)

[1] Web-search on 'scsi rescan linux' if not yet getting anywhere.
Could work.

-- 
Cheers,                                            "He who laughs last, lasts."
Rick Moen                                                       -- Leo Rosten
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