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Hello! I'm using Lenovo Legion 5 15ARH05H with Gnome. Adjusting the brightness of the screen does not work on my hardware when loading on the built-in video card.
At the same time, if select a discrete video card in the BIOS, overwriting
/sys/class/backlight/nv_backlight/brightness
changes correctly, although this does not work with the slider from the Gnome.
$ lspci -k | grep -A 2 -E "(VGA|3D)"
01:00.0 VGA compatible controller: NVIDIA Corporation TU106M [GeForce RTX 2060 Mobile] (rev a1)
Subsystem: Lenovo Device 3a47
Kernel driver in use: nvidia
--
06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev c6)
Subsystem: Lenovo Device 3a47
Kernel driver in use: amdgpu
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Also, GRUB_CMDLINE_LINUX="acpi_backlight=video" does not help.
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I'm added GRUB_CMDLINE_LINUX="acpi_backlight=vendor", in /sys/class/backlight create 2 symlinks
lrwxrwxrwx 1 root root 0 июн 7 11:03 amdgpu_bl0 -> ../../devices/pci0000:00/0000:00:08.1/0000:06:00.0/backlight/amdgpu_bl0
lrwxrwxrwx 1 root root 0 июн 7 11:03 ideapad -> ../../devices/pci0000:00/0000:00:14.3/PNP0C09:00/VPC2004:00/backlight/ideapad
but change value of `brightness` does not affected to system.
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