Thanks, I think there are some fixes in the bios for the video hot switch in 
windows 7 and I hope the diff between the dsts' would suggest what windows uses 
for the hot switch if it's via acpi at all.
I'm pretty certain the current sony-laptop switching model cannot work without 
cold reboot because it's based on the old hardware switch model which you can 
just enable in the bios.


      

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