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Thread: Screen brightness adjustment does not work

  1. #1
    Join Date
    Oct 2023
    Beans
    2

    Screen brightness adjustment does not work

    Hello!

    I have a laptop ASUS Vivobook D1603QA (with AMD).


    There is no screen brightness adjustment. It is not adjustable from the keyboard (using special knobs) and there is no "slider" in the interface.
    I deleted and reinstalled the drivers for the video card (AMD Radon) - nothing changes.
    At the same time, if I boot from a flash drive (in live mode), everything works fine.
    I read on the Internet that it is necessary to edit the config, but I don't have it as it should be.
    Code:
    $ cat /etc/default/grub | grep back
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    Additional info.
    Code:
    $ lsb_release -a
    No LSB modules are available.
    Distributor ID:	Ubuntu
    Description:	Ubuntu 22.04.3 LTS
    Release:	22.04
    Codename:	jammy
    Code:
    $ sudo lspci -vnn | grep -A10 VGA
    03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [1002:1638] (rev c6) (prog-if 00 [VGA controller])
    	Subsystem: ASUSTeK Computer Inc. Cezanne [1043:12ad]
    	Flags: bus master, fast devsel, latency 0, IRQ 47, IOMMU group 10
    	Memory at ffe0000000 (64-bit, prefetchable) [size=256M]
    	Memory at fff0000000 (64-bit, prefetchable) [size=2M]
    	I/O ports at f000 [size=256]
    	Memory at fce00000 (32-bit, non-prefetchable) [size=512K]
    	Capabilities: [48] Vendor Specific Information: Len=08 <?>
    	Capabilities: [50] Power Management version 3
    	Capabilities: [64] Express Legacy Endpoint, MSI 00
    	Capabilities: [a0] MSI: Enable- Count=1/4 Maskable- 64bit+
    08:41 dl#uni.dl.sm.ua[~] sudo lspci -k | grep -iA2 VGA
    Code:
    $ sudo lspci -k | grep -iA2 VGA
    03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne (rev c6)
    	Subsystem: ASUSTeK Computer Inc. Cezanne
    	Kernel driver in use: amdgpu
    Please help to solve the problem.

  2. #2
    Join Date
    Oct 2023
    Beans
    2

    Re: Screen brightness adjustment does not work

    It was necessary to do the opposite in the grub settings.
    I tried the following:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"and everything worked as it should.

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