Further testing - my netbook now resumes if it hasn't entered a "second level" 
of suspension. In the "light" suspend mode, the laptop wakes up when I press a 
key. In the "deep sleep" suspend mode, the laptop doesn't wake up on a key 
press, only when I press the power button. In the second situation, the wifi 
led turns on, the hdd led flashes, and the video stays off. This happens both 
with the open source driver and the binary fglrx driver (with 
acpi_sleep=s3_bios).
When the laptop has entered this "deep sleep" mode, sometimes even a poweroff 
isn't enough. I need to take out the battery and put it back, or it won't power 
on, giving the same symptoms - wifi led on, hdd led flashes once. Again, this 
happens with both open source and binary amd/ati drivers.
In windows suspend/resume works, and after long period suspended the laptop 
hibernates. Maybe there is some trigger to make it hibernate (which I can't 
find in the BIOS) that is hanging when it is trying to call some function we 
don't have under linux?

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https://bugs.launchpad.net/bugs/767975

Title:
  Video does not return after sleep with AMD E-350 Fusion APU and ATI
  closed driver (Natty Narwal Beta)

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