General Tech Notes

If you are running Lenovo Thinkpad T400 with more than 4gb of RAM and Windows 7 and discrete graphics, you may have a problem with video corruption when running with the integrated Intel video adapter / energy saving, but not with the ATI.  I found that it worked fine if I had less than 4gb of RAM.  The workaround to make it work with more RAM is a bios setting.  You can enable the virtualization hardware, but not the virtualized I/O.  With the vm I/O turned off, it works fine with lots of RAM and either video adapter.

Update: I think this only happens with 6gb ram ( 4 + 2 )

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