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#1 2021-06-07 07:50:25

mass_t
Member
Registered: 2015-04-21
Posts: 22

Backlight Ryzen 7 4800H

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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#2 2021-06-07 07:50:55

mass_t
Member
Registered: 2015-04-21
Posts: 22

Re: Backlight Ryzen 7 4800H

Also, GRUB_CMDLINE_LINUX="acpi_backlight=video" does not help.

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#3 2021-06-07 08:10:09

mass_t
Member
Registered: 2015-04-21
Posts: 22

Re: Backlight Ryzen 7 4800H

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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