Quoting eddyp:
> How can I put my laptop to sleep in this case?
USB is known to raise some issues with ACPI S3. A possible workaround is
removing the trouble-making USB module before entering S3:
modprobe -r uhci_hcd
echo "mem" > /sys/power/state
After resume, reload the USB stuff:
modprobe uhci_hcd
Works fine for me on a ThinkPad R32 (which won't suspend with "uhci_hci"
loaded either).
hth,
Stefan