Displaying 1 result from an estimated 1 matches for "c6q3a8aa".
2015 Jul 20
2
[Bug 91408] New: Lenovo T440s alternate way to turn off discrete GPU
...the old method to work, however the user needs to manually do
this and also new OSI strings keep being added in the kernel and so this might
silently re-break in the future.
The dump of the DSDT tables in the latest (as 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 comple...