Live USB systemd-backlight@backlight:acpi_video0.service loaded failed

I’ve been testing Deepin few days and encountering an error while starting liveusb

My screen light adjustement buttons which F11 & F12 works well and scren response well

I think its could be related keyboard backlight but my keyboard have one led indicator which on CapsLock button is working well during live seasion and after installation.

Just want to tell there is an error just error.

inxi -Fxz
System:    Kernel: 5.10.30-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 Desktop: Deepin 20.1 Distro: Manjaro Linux 
           base: Arch Linux 
Machine:   Type: Laptop System: Dell product: Inspiron 3585 v: 1.4.0 serial: <filter> 
           Mobo: Dell model: 0CNMRV v: X01 serial: <filter> UEFI: Dell v: 1.4.0 date: 05/29/2019 
Battery:   ID-1: BAT1 charge: 31.2 Wh (100.0%) condition: 31.2/42.0 Wh (74.2%) volts: 12.8 min: 11.4 
           model: Simplo 0x59,0x36,0x42,0x53,0x00,0x00,0x000C status: Full 
CPU:       Info: Quad Core model: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx bits: 64 type: MT MCP arch: Zen rev: 0 cache: 
           L2: 2 MiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 31940 
           Speed: 1371 MHz min/max: 1600/2000 MHz boost: enabled Core speeds (MHz): 1: 1371 2: 1372 3: 1371 4: 1370 5: 1371 
           6: 1372 7: 1484 8: 1389 
Graphics:  Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] vendor: Dell driver: amdgpu v: kernel 
           bus-ID: 04:00.0 
           Device-2: Realtek Integrated_Webcam_HD type: USB driver: uvcvideo bus-ID: 1-4:3 
           Display: x11 server: X.Org 1.20.11 driver: loaded: amdgpu,ati unloaded: modesetting s-res: 1920x1080 
           OpenGL: renderer: AMD Radeon Vega 8 Graphics (RAVEN DRM 3.40.0 5.10.30-1-MANJARO LLVM 11.1.0) v: 4.6 Mesa 21.0.2 
           direct render: Yes 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio vendor: Dell driver: snd_hda_intel 
           v: kernel bus-ID: 04:00.1 
           Device-2: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: Dell driver: snd_hda_intel v: kernel 
           bus-ID: 04:00.6 
           Sound Server-1: ALSA v: k5.10.30-1-MANJARO running: yes 
           Sound Server-2: JACK v: 0.125.0 running: no 
           Sound Server-3: PulseAudio v: 14.2 running: yes 
           Sound Server-4: PipeWire v: 0.3.25 running: no 
Network:   Device-1: Realtek RTL810xE PCI Express Fast Ethernet vendor: Dell driver: r8169 v: kernel port: 2000 
           bus-ID: 02:00.0 
           IF: enp2s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
           Device-2: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter vendor: Dell driver: ath10k_pci v: kernel 
           port: 2000 bus-ID: 03:00.0 
           IF: wlp3s0 state: down mac: <filter> 
Bluetooth: Device-1: Qualcomm Atheros type: USB driver: btusb v: 0.8 bus-ID: 3-2.4:5 
           Report: rfkill ID: hci0 rfk-id: 1 state: up address: see --recommends 
Drives:    Local Storage: total: 253.12 GiB used: 0 KiB (0.0%) 
           ID-1: /dev/nvme0n1 vendor: Toshiba model: KBG30ZMS256G NVMe 256GB size: 238.47 GiB temp: 44.9 C 
           ID-2: /dev/sda type: USB vendor: Generic model: Flash Disk size: 14.65 GiB 
Partition: Message: No partition data found. 
Swap:      Alert: No swap data was found. 
Sensors:   System Temperatures: cpu: 82.5 C mobo: 0 C gpu: amdgpu temp: 82.0 C 
           Fan Speeds (RPM): fan-1: 0 
Info:      Processes: 245 Uptime: 23m Memory: 5.76 GiB used: 2.42 GiB (42.1%) Init: systemd Compilers: gcc: 10.2.0 
           Packages: 1170 Shell: Bash v: 5.1.0 inxi: 3.3.04 

An system starts error just little one

systemctl list-units --state=failed
  UNIT                                            LOAD   ACTIVE SUB    DESCRIPTION                                                   
● systemd-backlight@backlight:acpi_video0.service loaded failed failed Load/Save Screen Backlight Brightness of backlight:acpi_video0

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
1 loaded units listed.


systemctl status systemd-backlight@backlight:acpi_video0.service
● systemd-backlight@backlight:acpi_video0.service - Load/Save Screen Backlight Brightness of backlight:acpi_video0
     Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; static)
     Active: failed (Result: exit-code) since Mon 2021-05-10 01:04:47 +03; 15min ago
       Docs: man:systemd-backlight@.service(8)
   Main PID: 727 (code=exited, status=1/FAILURE)

May 10 01:04:47 manjaro-deepin systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:acpi_video0...
May 10 01:04:47 manjaro-deepin systemd-backlight[727]: Failed to get backlight or LED device 'backlight:acpi_video0': No such device
May 10 01:04:47 manjaro-deepin systemd[1]: systemd-backlight@backlight:acpi_video0.service: Main process exited, code=exited, status=1/FAILURE
May 10 01:04:47 manjaro-deepin systemd[1]: systemd-backlight@backlight:acpi_video0.service: Failed with result 'exit-code'.
May 10 01:04:47 manjaro-deepin systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0.

Please see

aka, you have to manually add:

GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor"


GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_osi=\"Linux\""


GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_osi=\"!Windows 2012\""

or consult the How to Choose the Proper ACPI Kernel Argument

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