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[Jamie Strandboge <jamie@xxxxxxxxxx>]

There are ways to detect this in a VM, yes. It is my understanding that Windows looks at the video card driver. lspci should give enough info for this. Eg with the 'vmvga' and 'cirrus' kvm drivers (there are others that can be added):
$ lspci | grep VGA
00:02.0 VGA compatible controller: VMware SVGA II Adapter

$ lspci | grep VGA
00:02.0 VGA compatible controller: Cirrus Logic GD 5446

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https://bugs.launchpad.net/bugs/870024

Title:
  suspend on idle should be disabled when running inside a VM

Status in “gnome-settings-daemon” package in Ubuntu:
  New

Bug description:
  Suspend on idle does not work with our preferred virtualization
  technology of libvirt/qemu-kvm. The machine suspends, but there is no
  way to make it resume. I don't know if qemu-kvm and the VM bios
  supports it or if it is simply a bug in libvirt, but suspending in a
  VM by default is pointless as it only gets in the way of people's
  work. If I walk away from my computer, the host should suspend if I
  choose for it to do so, not the VM. Suspending/resuming the host with
  running VMs has worked fine for years so there should be no problem
  with this.

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