Comment 18 for bug 292144

Hooray!

Seems to have solved this issue with thinkpad X40 & ultrabay X4
Instructions from here:

http://mailman.linux-thinkpad.org/pipermail/linux-thinkpad/2008-March/042891.html
behind Daniel Gnoucheff's previous link
http://bugzilla.kernel.org/show_bug.cgi?id=11703

Before suspending after undocking, run

echo "0 0 0" > /sys/class/scsi_host/host1/scan

After that suspend / resume after undock works fine. Except that CD-Rom drive seems not to be recognized automatically when docked again.