XPS 7590 4k OLED backlight

I am currently running Sonoma 14.4.4 on my XPS 15 7590 with a 4k OLED-non-touch and everything is working except for the screen's backlight control.

So far I've tried manually creating the SSDT-PNLF, disabled the Nvidia GPU with SSDT-dGPU-Off.dsl and SSDT-NoHybGfx.dsl, boot-arg -igfxblr and -igfxblt (separately and both).

Backlight control still doesn't work. Has anyone managed to get backlight control working with the 4k OLED display?