Thanks for the thoughts. A couple of my own: 1) I'm beginning to suspect a very badly timed GPU start-of-death here. I'm hopefully going to be able to borrow another card this weekend to test. One of my supporting arguments for the dying-card theory is that I booted back into my very old 8.10 32-bit install (which I still have on the system for just-in-case) and the problem is reproducible there (though I never had the problem prior to the upgrade to 64-bit, along with the new mobo and psu I bought at that time since my old psu died and I wasn't happy with the specs of my old mobo). 2) If (1) isn't correct (and, in a way, I'm hoping it is, because I can solve that problem quite easily), then I am wondering if it's a crop-up of an old NVIDIA bug -- trawling forums around the 100.x.x release time, it was commonplace for 7-series nvidia cards to lock up with the proprietary drivers. It would be super-odd if this were the case now for the 173, 180 and 185 (beta, downloaded from nvidia.com) drivers. I've tried the ancient 96 drivers in the repo, but compiz behaves so badly I can't really even use the machine. I may sound like a spoiled brat, but I need my compiz (:
-d
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