Update: I just tried 535.86.05 on a boring, unpatched build of kernel.org 6.3.13. I have nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1 acpi_backlight=native in my GRUB_CMDLINE_LINUX_DEFAULT. Backlight control still doesn’t work, despite what is claimed in Brightness on a Lenovo ThinkPad P52 no longer controllable after updating nvidia-drivers to 525.xx series - #21 by amrits.