Ugh, that failed too. My current theory is that what really matters is whether the machine is docked with USB devices connected at boot. Apparently if I boot undocked, then dock, I can suspend/resume just fine, but if I boot in the dock, suspend will fail unless I disconnect my USB devices first. I haven't tried booting docked and /then/ connecting the USB devices yet.
Ugh, that failed too. My current theory is that what really matters is whether the machine is docked with USB devices connected at boot. Apparently if I boot undocked, then dock, I can suspend/resume just fine, but if I boot in the dock, suspend will fail unless I disconnect my USB devices first. I haven't tried booting docked and /then/ connecting the USB devices yet.