I have installed Suse 10.0 on an external disk that I plug into my
laptop. When I try to suspend KPowersave gives me the following error:

suspend2disk failed on unloading 'usb_storage'. Trying to recover...

Is there a way to fix this? Or is it inherently impossible to suspend
if Linux is installed on a USB drive?

More info: I can dual boot Suse or Windows (installed on the internal
disk) using GRUB, which is also on the USB disk. Thanks for your help.