Another data point: It crashed with a YouTube clip running and the last
audio sample kept repeating over and over, indicating again that the
system isn't completely dead as much as userland processes are blocked.

Once again, is there anything I can do to to help find this? It happens
on every single kernel after the last Gutsy one, so it must be something
in common with all of them. And one of the main things changed is the
scheduler, which to me would make it a prime suspect. Anything I can do
at all?

If there really isn't, then I am ready to throw in the towel by now, and
find a way to downgrade this machine to Gutsy again. Or, if downgrading
while keeping my data is not an option, try Redhat or Suse instead; they
do have their own kernel builds which may be without this issue.

As it is, this machine is almost unuseable, since I have to be
constantly prepared for another lockup, and since anything putting a
load on the machine increases the chance. The Gutsy kernel doesn't lock
up, but suspend doesn't work, and it suffers rather horribly from that
excess of kernel events (much worse than when I was actually running
Gutsy) which mean I soon have to reboot to get rid of it. I'm happy to
keep at this as long as I have any kind of expectation that it will help
resolve the issue, but if it doesn't help at all I'd rather have a
functional system and give up on Hardy for now.

-- 
Hardy kernel causes overheating
https://bugs.launchpad.net/bugs/223081
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