Comment 38 for bug 37472

Have you tried, as a ugly workaround, unloading the modules mentioned in the kernel bug report?

Edit /etc/default/acpi-support's MODULES and add

sbp2 ohci1394 ieee1394 ehci_hcd uhci_hcd usbcore

And while you're at it, add a "sync" call to the end of /etc/acpi/prepare.sh (to make sure the disk cache buffers are clear before acpi suspend fails and your FS has to replay logs)

The new kernel should not require the 1394 modules to be unloaded, as I understand it.