Comment 8 for bug 6367

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roh (roh) wrote : Re: IDE enumeration differs between docked and undocked on ThinkPad T42

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)