After reverting the laptop to x86, I wasn't happy with the bugs in mesa-7.5, especially since they were solved in 7.6, so I keyworded X.org, Mesa and their dependencies and took a deep breath. Not such a deep breath, as I had recently done the same thing on the desktop to no ill effect. So the laptop was cruising with xorg-server-1.7 and mesa-7.7, and everything seemed fine. However, an old problem had returned, or possibly a new one had appeared. Either way, the symptom was that the laptop would occasionally hang after resuming from sleep. Wasn't happening all the time, but often enough to be very annoying, as the only way out was by magic sysrq. On a hunch, I disabled KDE-4's desktop effects and it hasn't happened since. Doesn't sound like a fun problem to debug if it means rebooting every time it occurs, so I think I'll leave this one to the pros.
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