Comment 2 for bug 450461

Looking more closely at the issue that the machine does'nt suspend at all, it turned out that there were processes spawned by /usr/lib/pm-utils/sleep.d/01PulseAudio (pacmd, awk) still hanging around. Manually killing them made the machine suspend. Resuming afterwards failed, though.
Completely removing 01PulseAudio from /usr/lib/pm-utils/sleep.d makes suspend/resume work again.