Looks like I wasn't completely right above. I don't know yet whether
userspace is using the ioctl or not, but it seems that calling the ioctl
directly also fails when X is frontmost.

Among other things I've noticed:

 - the APM emulation module isn't loaded by default.
 - the kernel isn't switching to text console before suspend

The 2 above together means that X has no chance to quiesce the graphics
engine and properly re-initialize it on wakeup, which probably explains
some of the problems. I've  manually loaded apm-emu and restart X, but
that didn't fully fix the problem, so there is still something else
going on. I'll try to investigate and let you know. In the meantime,
apm-emu should definitely be added to the loaded-by-default list of
modules at least on powerbooks.

-- 
[gutsy] sleep on powerbook crashes
https://bugs.launchpad.net/bugs/144305
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