I ran a test suspend on booting that I read about in the kernel
documentation and got a curious result.

I added test_suspend=mem to the kernel boot time parameters (in grub)
and my laptop did the following:

* Blanked the display
* Let out a series of system beeps
* Continued to boot AFTER I hit the keyboard (I could see the hard drive light 
going for a little while)
* The display did not reactivate

So I hit the power button and it shut itself down (while the screen
remained blank). I'm sure it resumed, somewhat properly, because it was
able to WRITE the kernel log file. Kern.log had an entry "PM: Finishing
wakeup.", evidencing something of a suspend / resume event and
subsequent hard drive activity.

I guess you could call that a partially successful suspend / resume. It
is worth reiterating that this was a kernel test suspend run during the
boot process.

-- 
HP Pavilion dv5: ATA exception on resume from suspend
https://bugs.launchpad.net/bugs/301353
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