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gpo
2015 Jul 20
2
[Bug 91408] New: Lenovo T440s alternate way to turn off discrete GPU
...of today) BIOS of the T440s is
available there : http://pastebin.com/raw.php?i=C6Q3A8aa
The important changes to note when "Windows 2013" is in the osi string:
- OSYS is set to 0x07DD.
- This in turn cause VMSH to be set to 1.
- This in turn causes _SB_.PCI0.PEG_.VID_.PS3 to _NOT call GPOF when the
device is set to D3.
- and so the card is never really turned off completely
Now if you look at how GPOF can be called, you can see it will be called as
part of NVP3 power resource which is PR3 ... but on the node _SB.PCI0.PEG_ and
not _SB_.PCI0.PEG_.VID_ !
So this means that the parent...