[Bug 6367] IDE enumeration differs between docked and undocked on ThinkPad T42

[roh]

Public bug report changed:
https://launchpad.net/malone/bugs/6367

Comment:
the same happens with the ThinkPad X20 and the full dock.
siimage gets loaded before piix and so the hdd is hde and the dvdrom gets hda
for a generic solution https://wiki.ubuntu.com/ProbeForRootFilesystem
seems to be the right way (rootfs-by-uuid)