V1S: Hardware virtualization reported as unavailable after return from sleep, available before.

Hi,
I have a V1S with a T7700 Duo, with intel VT extensions (the VX* instructions). Virtual PC detects and uses that, but when i sleep and return, VPC decides that HW virtualization is not supported on this computer. Any idea what might be wrong?
(Hey, I'm a programmer, I checked the Intel System Programmers' manual, and VT should be exposed through CPUID instruction. How can CPUID result differ after return from sleep?!)

 

I would imagine it's probably left in an uninitialized state when it comes back from sleep (sort of like the processor serial number debacle back in the old PentiumIII days). Or maybe the level of sleep might have something to do with it.

Either way, that looks like something like that would probably need a firmware fix.

 

Is someone else experiencing similar problems? The CPUID instruction shouldn't depend on firmware, though (and if it does that's bad, bad design!).
It's also stateless, so sleep shouldn't affect it. I'm baffled by this bug, really. I hope the problem's with Virtual PC not properly exiting or saving/restoring VMX mode.

 

Before we start to track down the problem, I suggest you try CPU-Z or other CPU identification programs, so we would know whether the problem is from the CPUID instruction, or other subsystems [maybe the program is try to detect this through a function windows or some sort of API that has bugs ?]

 

It's a known issue with Intel CPUs and virtualisation, and I believe isn't limited to just Asus machines. I personally drop the laptop into hibernate and back if I want to use VirtualPC.