This is still happening very regularly (about 50% of the time I resume
from suspend).

I've found that if I disable swap, something similar happens — very
unresponsive system, massive disk activity,  very high CPU activity
(without it being attributed to any one process - according to top it's
spending 95% of the time waiting for IO, but no processes are using much
of the CPU).  Without swap however, it takes 'forever' to recover - I
waited an hour and then gave up.

I've found that the only thing which seems to help restore
responsiveness is killing X with Ctrl-Alt-Backspace.

Some other possibly related info: I was recently on holiday using the
laptop often without the power cable plugged in, which gives me
different power settings, and I found for the week, this problem very
rarely occurred.  It might have been fluke, or it might have been
related to the different power settings.

-- 
Everything gets swapped out after resume from suspend using fglrx drivers
https://bugs.launchpad.net/bugs/391628
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