• Failed to start Load/Save Screen Backlight Brightness

    Hi everyone, I’m getting this error on boot:

    How can I fix it?
    I added this line to grub file (/etc/default/grub) but I haven’t fixed this issue.

    GRUB_CMDLINE_LINUX_DEFAULT="quiet idle=nomwait acpi_backlight=vendor"


  • @alex27riva
    Fixing backlight can be very machine dependent. So could you show some info about your machine, e.g. like this:

    sudo pacman -S --needed yay
    yay -S inxi
    inxi -Fc0
  • Here the output:

    System: Host: Matebook-Ale Kernel: 5.0.10-arch1-1-ARCH x86_64 bits: 64 Desktop: Deepin 15.10 Distro: Antergos Linux
    Machine: Type: Laptop System: HUAWEI product: KPL-W0X v: M1D serial: <root required>
    Mobo: HUAWEI model: KPL-W0X v: M1D serial: <root required> UEFI: HUAWEI v: 1.19 date: 01/11/2019
    Battery: ID-1: BAT1 charge: 50.1 Wh condition: 56.9/56.3 Wh (101%)
    CPU: Topology: Quad Core model: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx bits: 64 type: MT MCP L2 cache: 2048 KiB
    Speed: 1501 MHz min/max: 1600/2000 MHz Core speeds (MHz): 1: 1369 2: 1369 3: 1541 4: 1667 5: 1368 6: 1368 7: 1596
    8: 1516
    Graphics: Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] driver: amdgpu v: kernel
    Display: x11 server: X.Org 1.20.4 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1080~60Hz
    OpenGL: renderer: AMD RAVEN (DRM 3.27.0 5.0.10-arch1-1-ARCH LLVM 8.0.0) v: 4.5 Mesa 19.0.3
    Audio: Device-1: Advanced Micro Devices [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio driver: snd_hda_intel
    Device-2: Advanced Micro Devices [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor driver: N/A
    Device-3: Advanced Micro Devices [AMD] Family 17h HD Audio driver: snd_hda_intel
    Sound Server: ALSA v: k5.0.10-arch1-1-ARCH
    Network: Device-1: Intel Wireless 8265 / 8275 driver: iwlwifi
    IF: wlp1s0 state: up mac: a0:a4:c5:61:8a:50
    Drives: Local Storage: total: 238.47 GiB used: 25.04 GiB (10.5%)
    ID-1: /dev/sda vendor: SK Hynix model: HFS256G39TNF-N3A0A size: 238.47 GiB
    Partition: ID-1: / size: 226.08 GiB used: 24.97 GiB (11.0%) fs: ext4 dev: /dev/sda3
    ID-2: /boot size: 487.9 MiB used: 63.7 MiB (13.1%) fs: ext4 dev: /dev/sda2
    ID-3: swap-1 size: 6.77 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda4
    Sensors: System Temperatures: cpu: 35.2 C mobo: N/A gpu: amdgpu temp: 35 C
    Fan Speeds (RPM): N/A
    Info: Processes: 216 Uptime: 1h 00m Memory: 6.77 GiB used: 1.63 GiB (24.1%) Shell: bash inxi: 3.0.33

  • Fixed, the grub.cfg file need to be regenerated after modifying grub file using this command:

    sudo grub-mkconfig -o /boot/grub/grub.cfg
brightness18 backlight8 loadsave1 Posts 5Views 75
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