Linux on GK5CP6V-S

Quirks to make Linux work flawlessly on GK5CP6V-S based laptops.

There are chances for these quirks to work on other similar models, such as GK5CN5Z, GK5CN6Z, GK5CQ7Z, GK5CP0Z.

Hardware

Quick specs

Component	Description
CPU	Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
dGPU	NVIDIA Geforce GTX 1660 Ti
Screen	1080p60
Ethernet	Realtek RTL8111/8168/8411
USB Ports	3 type A, 1 type C
Display Ports	1 HDMI 2.0, 2 miniDP, all wired to dGPU

Known laptops based on this platform

• Hasee Z7-CT7VH
• Shinelon T3 Ti (Tongfang model, not Clevo)
• Some Mechrevo laptops
• Some Walmart laptops

They're much cheaper than the Kubuntu Focus Linux laptop. ;-)

What works

• Suspend to RAM & resume
• Wifi + BT
• LCD backlight control
• Switch between iGPU / dGPU
• HDMI audio
• USB Type-C host mode
• Touchpad
• Other things that should work on all PCs

What doesn't work

• USB Type-C in some mode other than host mode (idk if it supports charging)
• Card reader + suspend to S3

Problems & Workarounds

All related files are in the files directory.

As of kernel 5.3.7 + NVIDIA proprietary driver 440.26:

Freeze when resuming from S3

This is caused by multiple crappy components or their proprietary specs :

• Touchpad
• Card reader
• USB Type-C power control(?) driver (you don't need it to use it as host)
• Faulty ACPI & IOMMU & MMCONFIG implementation and/or PCIe device drivers

Workarounds:

• Blacklist kmods for TypeC & Card reader (since they're not used by most people)
• Unload touchpad driver before suspend, and reload it after resume
• Kernel cmdline: pci=nommconf acpi_osi=Linux intel_iommu=off

dGPU burning battery even when using only iGPU

It burns battery at 1 amps @ 12.5 volts. That's insane, please blame Tongfang HK.

Workaround:

• Use acpi_call to turn off its power after X11 startup ASAP.
• Don't use bbswitch, it will crash the system.

Warning for TLP users: Please blacklist all pci ids of the dGPU, otherwise the system will freeze when turning it off.