Brightness regulation not working

I have a problem with fn shortcuts responsible for backlight brightness regulation. System is detecting that I’m using them but nothing really happens, only nice slider appears on the screen.

I tried to set GRUB_CMDLINE_LINUX="acpi_backlight=$VALUE" in /etc/default/grub then sudo update-grub, but It’s not working either - only error (same as here) from boot screen disapears.

I also tired to create something like macro with help of this post but it’s not working. Later on I double checked everything, I corrected the spotted error in adjust-brightness.service file and still nothing. Also i didn’t had ~/.config/systemd/user/ dir created, I think it’s worth mentioning.

xrandr --output eDP --brightness 0.5 command is working tho.

I’ve updated kernel to 5.11.4-1-rt11 but there was same situation on original 5.10.


inxi -Fxz
System:    Kernel: 5.11.4-1-rt11-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 Desktop: KDE Plasma 5.22.4 
           Distro: Manjaro Linux base: Arch Linux 
Machine:   Type: Laptop System: LENOVO product: 82EY v: IdeaPad Gaming 3 15ARH05 serial: <filter> 
           Mobo: LENOVO model: LNVNB161216 v: NO DPK serial: <filter> UEFI: LENOVO v: FCCN13WW date: 06/29/2020 
Battery:   ID-1: BAT0 charge: 26.1 Wh (56.5%) condition: 46.2/45.0 Wh (102.7%) volts: 11.4 min: 11.4 model: SMP L19M3PF7 
           status: Discharging 
CPU:       Info: 8-Core model: AMD Ryzen 7 4800H with Radeon Graphics bits: 64 type: MT MCP arch: Zen 2 rev: 1 cache: 
           L2: 4 MiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 92668 
           Speed: 1397 MHz min/max: 1400/2900 MHz boost: disabled Core speeds (MHz): 1: 1397 2: 1398 3: 1397 4: 1397 5: 1397 
           6: 1397 7: 1397 8: 1397 9: 1397 10: 1396 11: 1397 12: 1396 13: 1397 14: 1397 15: 1397 16: 1397 
Graphics:  Device-1: NVIDIA TU117M vendor: Lenovo driver: nvidia v: 470.57.02 bus-ID: 01:00.0 
           Device-2: Advanced Micro Devices [AMD/ATI] Renoir vendor: Lenovo driver: amdgpu v: kernel bus-ID: 05:00.0 
           Device-3: IMC Networks Integrated Camera type: USB driver: uvcvideo bus-ID: 1-3:2 
           Display: x11 server: X.Org 1.20.11 driver: loaded: amdgpu,ati unloaded: modesetting resolution: 1920x1080~120Hz 
           OpenGL: renderer: AMD RENOIR (DRM 3.40.0 5.11.4-1-rt11-MANJARO LLVM 12.0.1) v: 4.6 Mesa 21.1.5 direct render: Yes 
Audio:     Device-1: NVIDIA vendor: Lenovo driver: snd_hda_intel v: kernel bus-ID: 01:00.1 
           Device-2: Advanced Micro Devices [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor vendor: Lenovo driver: N/A 
           bus-ID: 05:00.5 
           Device-3: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus-ID: 05:00.6 
           Sound Server-1: ALSA v: k5.11.4-1-rt11-MANJARO running: yes 
           Sound Server-2: JACK v: 1.9.19 running: no 
           Sound Server-3: PulseAudio v: 14.2 running: yes 
           Sound Server-4: PipeWire v: 0.3.32 running: no 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8169 v: kernel port: 3000 
           bus-ID: 03:00.0 
           IF: eno1 state: down mac: <filter> 
           Device-2: Realtek RTL8822CE 802.11ac PCIe Wireless Network Adapter vendor: Lenovo driver: rtw_8822ce v: N/A 
           port: 2000 bus-ID: 04:00.0 
           IF: wlp4s0 state: up mac: <filter> 
Bluetooth: Device-1: Realtek Bluetooth Radio type: USB driver: btusb v: 0.8 bus-ID: 3-3:2 
           Report: rfkill ID: hci0 rfk-id: 3 state: down bt-service: enabled,running rfk-block: hardware: no software: yes 
           address: see --recommends 
Drives:    Local Storage: total: 471.36 GiB used: 135.41 GiB (28.7%) 
           ID-1: /dev/nvme0n1 vendor: Samsung model: MZALQ256HAJD-000L2 size: 238.47 GiB temp: 34.9 C 
           ID-2: /dev/sda vendor: A-Data model: SU720 size: 232.89 GiB 
Partition: ID-1: / size: 233.24 GiB used: 92.27 GiB (39.6%) fs: ext4 dev: /dev/nvme0n1p2 
           ID-2: /boot/efi size: 511 MiB used: 148 KiB (0.0%) fs: vfat dev: /dev/nvme0n1p1 
Swap:      Alert: No swap data was found. 
Sensors:   System Temperatures: cpu: 42.0 C mobo: N/A gpu: amdgpu temp: 42.0 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 334 Uptime: 2m Memory: 15.08 GiB used: 2.32 GiB (15.4%) Init: systemd Compilers: gcc: 11.1.0 
           Packages: 1427 Shell: Bash v: 5.1.8 inxi: 3.3.06


Is EOL = end of life and no longer in repositories. How did you updated that kernel and when?
Please check this as it might help

1 Like

Is EOL = end of life and no longer in repositories. How did you updated that kernel and when?
Please check this as it might help

Few weeks ago with system settings, I will try update later to something else.
Also I will try do thing from this post and I will let you know how it turned out.

You were right, that was kernel problem. Now I’m running 5.12.19-1-MANJARO x86_64 and everything works just fine. Also I left amdgpu.backlight=0 in /etc/default/grub. I do not know if it has any impact but I am writing if someone else had the same problem with brightness regulation in the case of AMD iGPU.

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