OK, so I just tried something entirely different. My grub options now
look as follows:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash threadirqs acpi_osi=Linux"

Now the resumes work without any of the other options and I've had a
couple of them so far without any problems. Of course, I will need to do
more testing but it seems that by informing BIOS that you're running
Linux suspend appears to work without any additional workarounds/fixes
(at least so far). My hardware is HP dm1z with ADM HD6310 APU, more
specifically model dm1-4142nr.

I also learned today that you can spoof BIOS to think you are running
Windows by passing kernel acpi_os_name option as apparently some BIOSes
only enable all the necessary options if they detect "genuine" Windows
running... How sad... But I digress... What I am trying to say is that
this will be my next test in case acpi_osi fails.

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https://bugs.launchpad.net/bugs/1082851

Title:
  Screen stays black after suspend with AMD Fusion APUs and fglrx driver

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