Code:
18a19
> External (\_SB_.PCI0.PEG0.PEGP.DD02) <- DD02 is your LVDS display when discrete GPU utilizes it.
112d112
< Name (SLPO, Zero)
130c130
< OperationRegion (GNVS, SystemMemory, 0xBAF42E18, 0x01B0)
---
> OperationRegion (GNVS, SystemMemory, 0xBAF41E18, 0x01B0)
352c352,353
< OPTF, 8,
---
> OPTF, 4,
> SLPO, 4,
655c656
< OperationRegion (PNVS, SystemMemory, 0xBAE0D018, 0x100E)
---
> OperationRegion (PNVS, SystemMemory, 0xBAE0C018, 0x100E)
3764a3766,3769
> If (LEqual (BRID, One))
> {
> Notify (^^^PEG0.PEGP.DD02, 0x86)
> }
3959a3965,3968
> If (LEqual (BRID, One))
> {
> Notify (^^^PEG0.PEGP.DD02, 0x86)
> }
4055a4065,4068
> If (LEqual (BRID, One))
> {
> Notify (^^^PEG0.PEGP.DD02, 0x87)
> }
4247a4261,4264
> If (LEqual (BRID, One))
> {
> Notify (^^^PEG0.PEGP.DD02, 0x87)
> }
5375c5392
< Zero,
---
> One,
5939a5957,5960
> If (LEqual (BRID, Zero))
> {
> Store (Zero, SLPO)
> }
to allow for monitor sleep/wake functionality (used in _PTS (Prepare to Sleep) and _WAK (Wake) ACPI methods) when discrete GPU is chosen in manual mode.
Also notifications to LVDS were added (0x86 and 0x87) ... the same way IGPU is being notified, when EC queries Q80 and Q81 are executed (these are executed when you increase or decrease brightness using hotkeys from the keyboard). It just involves an additional check to determine if discrete GPU is set as active.
Here's a decompiled dsdt dump from both absolutely clean bios flashes (no mods):
