Thinkpad T400: Suspend to HD doesn't resume

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http://unix.stackexchange.com – I've got a Thinkpad T400 with Gentoo Linux installed. Suspend-to-RAM works like a charm. However, Susped-to-Disk doesn't work: if I suspend, the Laptop powers down and accesses the HD for around 30s. However, if I switch it back on, it just boots as normal, but doesn't resume to the previous state. Here's the /var/log/pm-suspend.log just before the suspend: Sun Oct 21 14:16:44 CEST 2012: Finished. Initial commandline parameters: Blacklisting 01grub. Sun Oct 21 15:26:06 CEST 2012: Running hooks for hibernate. Running hook /usr/lib64/pm-utils/sleep.d/00logging hibernate hibernate: Linux rgs- (HowTos)