I managed to make it suspend. As you said, ohci_hcd crashes and therm_adt746x does not terminate, so one should rmmod them before.
But I can't resume. After the kernel reboot, and just before INIT launch, the kernel complains PM: Reading pmdisk image PM: Resume from disk failed and after that, the swap lost its signature (is it the normal pmdisk behavior ?). I have to make mkswap before using it. -- Sylvain Joyeux