Failed to start Load/Save Screen Backlight Brightness of amdgpu_bl1

Support Graphics & Display
1

Hello everyone
Today I reinstalled Manjaro KDE
Previously, all things were fine, but now I have a problem(AGAIN)
When I boot I see this error:

Failed to start Load/Save Screen Backlight Brightness of amdgpu_bl1.

And also my brightness is ALWAYS set to 100% after each boot which is so annoying
After that, I tried to start the service manually:

sudo systemctl start systemd-backlight@amdgpu_bl1.service

Job for systemd-backlight@amdgpu_bl1.service failed because the control process exited with error code.
See "systemctl status systemd-backlight@amdgpu_bl1.service" and "journalctl -xe" for details.

Then I checked the systemd:

systemctl status systemd-backlight@amdgpu_bl1.service

â—Ź systemd-backlight@amdgpu_bl1.service - Load/Save Screen Backlight Brightness of amdgpu_bl1
     Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; static)
     Active: failed (Result: exit-code) since Wed 2020-12-09 17:01:57 +0330; 10s ago
       Docs: man:systemd-backlight@.service(8)
    Process: 2355 ExecStart=/usr/lib/systemd/systemd-backlight load amdgpu_bl1 (code=exited, status=1/FAILURE)
   Main PID: 2355 (code=exited, status=1/FAILURE)

Dec 09 17:01:57 Mtn-Lap systemd[1]: Starting Load/Save Screen Backlight Brightness of amdgpu_bl1...
Dec 09 17:01:57 Mtn-Lap systemd-backlight[2355]: Requires a subsystem and sysname pair specifying a backlight device.
Dec 09 17:01:57 Mtn-Lap systemd[1]: systemd-backlight@amdgpu_bl1.service: Main process exited, code=exited, status=1/FAILURE
Dec 09 17:01:57 Mtn-Lap systemd[1]: systemd-backlight@amdgpu_bl1.service: Failed with result 'exit-code'.
Dec 09 17:01:57 Mtn-Lap systemd[1]: Failed to start Load/Save Screen Backlight Brightness of amdgpu_bl1.

Since I’m using a hybrid laptop(amd/nvidia) I decided to install optimus-switch-amd-sddm
Even after didn’t work
I also added acpi_backlight=vendor to my grub, no luck
My specs:

System:    Kernel: 5.9.11-3-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 Desktop: KDE Plasma 5.20.4 tk: Qt 5.15.2 
           wm: kwin_x11 dm: SDDM Distro: Manjaro Linux 
Machine:   Type: Laptop System: HP product: HP Pavilion Gaming Laptop 15-ec1xxx v: N/A serial: <superuser/root required> 
           Chassis: type: 10 serial: <superuser/root required> 
           Mobo: HP model: 87B1 v: 31.17 serial: <superuser/root required> UEFI: AMI v: F.02 date: 05/14/2020 
Battery:   ID-1: BAT0 charge: 28.5 Wh condition: 46.9/46.9 Wh (100%) volts: 11.1/11.6 model: Hewlett-Packard Primary 
           type: Li-ion serial: N/A status: Discharging cycles: 422 
CPU:       Info: 6-Core model: AMD Ryzen 5 4600H with Radeon Graphics bits: 64 type: MT MCP arch: Zen rev: 1 
           L2 cache: 3072 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 71897 
           Speed: 1984 MHz min/max: 1400/3000 MHz boost: enabled Core speeds (MHz): 1: 2144 2: 2081 3: 2218 4: 2211 5: 2420 
           6: 2420 7: 1383 8: 1383 9: 1383 10: 1383 11: 1383 12: 1382 
Graphics:  Device-1: NVIDIA TU117M vendor: Hewlett-Packard driver: N/A bus ID: 01:00.0 chip ID: 10de:1f99 
           Device-2: Advanced Micro Devices [AMD/ATI] Renoir vendor: Hewlett-Packard driver: amdgpu v: kernel bus ID: 05:00.0 
           chip ID: 1002:1636 
           Device-3: Luxvisions Innotech Limited HP TrueVision HD Camera type: USB driver: uvcvideo bus ID: 3-3:3 
           chip ID: 30c9:0013 serial: 0001 
           Display: x11 server: X.Org 1.20.10 compositor: kwin_x11 driver: amdgpu resolution: 1920x1080~60Hz s-dpi: 96 
           OpenGL: renderer: AMD RENOIR (DRM 3.39.0 5.9.11-3-MANJARO LLVM 11.0.0) v: 4.6 Mesa 20.2.3 direct render: Yes 
Audio:     Device-1: Advanced Micro Devices [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor vendor: Hewlett-Packard 
           driver: N/A bus ID: 05:00.5 chip ID: 1022:15e2 
           Device-2: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: Hewlett-Packard driver: snd_hda_intel v: kernel 
           bus ID: 05:00.6 chip ID: 1022:15e3 
           Sound Server: ALSA v: k5.9.11-3-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Hewlett-Packard driver: r8169 v: kernel 
           port: e000 bus ID: 02:00.0 chip ID: 10ec:8168 
           IF: eno1 state: down mac: b0:5c:da:42:34:3f 
           Device-2: Realtek RTL8822CE 802.11ac PCIe Wireless Network Adapter vendor: Hewlett-Packard driver: rtw_8822ce 
           v: N/A port: d000 bus ID: 03:00.0 chip ID: 10ec:c822 
           IF: wlo1 state: up mac: 70:66:55:bb:04:b7 
           Device-3: Realtek 802.11ac WLAN Adapter type: USB driver: btusb bus ID: 1-4:3 chip ID: 0bda:b00c 
           serial: 00e04c000001 
Drives:    Local Storage: total: 476.94 GiB used: 7.38 GiB (1.5%) 
           ID-1: /dev/nvme0n1 vendor: Toshiba model: KBG40ZNV512G KIOXIA size: 476.94 GiB speed: 31.6 Gb/s lanes: 4 
           serial: 306PEEC9PBV1 rev: HP00AE00 scheme: GPT 
Partition: ID-1: / size: 275.15 GiB used: 7.35 GiB (2.7%) fs: ext4 dev: /dev/nvme0n1p4 
Swap:      Alert: No Swap data was found. 
Sensors:   System Temperatures: cpu: 48.1 C mobo: N/A gpu: amdgpu temp: 46.0 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 262 Uptime: 5m Memory: 7.21 GiB used: 1.26 GiB (17.4%) Init: systemd v: 246 Compilers: gcc: 10.2.0 
           Packages: pacman: 1046 Shell: Bash v: 5.0.18 running in: konsole inxi: 3.1.08
2

Ok I managed to solve the problem by myself
I was looking for what was causing the problem that I found this:

sudo systemctl status systemd-backlight@backlight:amdgpu_bl0

â—Ź systemd-backlight@backlight:amdgpu_bl0.service - Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0
     Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; static)
     Active: failed (Result: exit-code) since Thu 2020-12-10 19:22:42 +0330; 23s ago
       Docs: man:systemd-backlight@.service(8)
    Process: 956 ExecStart=/usr/lib/systemd/systemd-backlight load backlight:amdgpu_bl0 (code=exited, status=1/FAILURE)
   Main PID: 956 (code=exited, status=1/FAILURE)

Dec 10 19:22:42 Mtn-Lap systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0...
Dec 10 19:22:42 Mtn-Lap systemd-backlight[956]: amdgpu_bl0: Failed to write system 'brightness' attribute: No such device or address
Dec 10 19:22:42 Mtn-Lap systemd[1]: systemd-backlight@backlight:amdgpu_bl0.service: Main process exited, code=exited, status=1/FAILURE
Dec 10 19:22:42 Mtn-Lap systemd[1]: systemd-backlight@backlight:amdgpu_bl0.service: Failed with result 'exit-code'.
Dec 10 19:22:42 Mtn-Lap systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0.

Ok so I simply tried to run that manually

sudo systemctl start systemd-backlight@backlight:amdgpu_bl0

And that’s it!!!
It solved the problem
But I had to create a systemd service so that it runs on every boot
I searched a lot and found these two links:

  1. How do I make a systemd service and enable it?
  2. Cannot restore backlight on AMD VGA after systemd upgrade / Kernel & Hardware / Arch Linux Forums

Then I tried to combine them and I wrote this service:

sudo nano /etc/systemd/system/startup-brightness.service

[Unit]
Description= Fixing screen brightness on boot

[Service]
Type=oneshot
ExecStart=/opt/fix-brightness.sh

[Install]
WantedBy=systemd-backlight@backlight:amdgpu_bl0.service

And then:

sudo systemctl enable --now startup-brightness

The problem with saving brightness is now SOLVED
But still I see the error on boot screen
That’s the only problem left
I have three questions:

  1. How can I edit that service so that I don’t need to write another script to just run that one line of code
  2. Why didn’t the systemd do that itself?
  3. If the problem is solved, then why do I still see that error on boot screen? Is that because of the line
    WantedBy=systemd-backlight@backlight:amdgpu_bl0.service ?
1 Like
3

This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.