@Phillip Susi: Unfortunately, I already have the latest BIOS version. I
re-updated and also did a CMOS reset. Still, Windows 7's suspend works
reliably. : (

I did 10+ runs of kernel suspend debugging with dmesg. Here are lines
that contained "hash match":

run 3:
[    1.384280] tty ttyS25: hash matches
[    1.384296] pci_link PNP0C0F:00: hash matches

run 5:
[    1.356874] bdi 1:1: hash matches

run 8:
[    1.337032] tty ttyS27: hash matches
[    1.337047] pci_link PNP0C0F:02: hash matches

run 12:
[    1.356872] tty tty30: hash matches

Keep in mind, that those didn't show up reliably. Most of the time there
was no line "hash match" at all.

On my mainboard, there are 3 pci express slots, but only 1 is used by an
Nvidia graphics card. I also tried using another slot and removing the
gpu altogether to suspend via ssh. It didn't make a difference.

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https://bugs.launchpad.net/bugs/760842

Title:
  Natty Narwhal/Sandy Bridge Suspend Fails

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