Gamesir G7 Pro 8k extreme input lag with 8k/4k polling rates

Issues & Assistance
1

Controller:
firmware: 2.1.0, wired, Xinput mode

PC:
14900KS, 7900 XTX, ASUS Z790 Apex Encore, kernel 7.0.0

Driver in use:
xpad

Issue:
Getting extreme input lag when using a polling rate of 8k or 4k (range of 2 to 10 seconds) across all games. Switching to a 1k polling rate removes all input lag. On Windows the 8k/4k polling rate has no input lag.

Things I’ve tried:
tested on all usb ports
pinned controller’s irq to only the P-cores
disabled usb autosuspend
disabled my CPU’s Cstates
enable/disable Steam input
launch a game from Heroic instead of Steam
launch game with/without the proton flags: SDL_JOYSTICK_HIDAPI=0 PROTON_PREFER_SDL=1 PROTON_ENABLE_WAYLAND=1

Thoughts:
My PC has more than enough power to handle a 8K polling rate. I also use an OP1 8K mouse & have no issues with it. And the fact that the controller with a 8k polling rate works completely fine on Windows means it’s not the hardware.
Is there something I’m missing?
Is there another driver I could try?
Or is using a controller with a 8k/4k polling rate a lost cause on Linux?

2

Update:

Switching to DS4 mode on the controller allows for 8k/4k polling with low input lag as it uses the hid_playstation driver. I verified the polling rate with evhz.

Changing to Switch mode also works great, however, acting as a Switch Pro Controller…the triggers will no longer be analog.

Forza Horizon 6:

This game does not play nice with PlayStation controllers, even with Steam Input enabled I couldn’t get it to detect the controller.

Workaround: use sc-controller to emulate a Xbox 360 controller