Hello! I did a fresh install of Manjaro 21.2.4 (Kernel 5.15.25-1-MANJARO). I am unable to change the brightness for my screen, if I try to change the brightness it will give me the icon saying the brightness is changing but the actual brightness is staying at 100%. My installation is on a Lenovo laptop with an integrated AMD CPU/GPU and a dedicated NVIDIA GPU.
Which graphical drivers are used? What is the output of hwinfo --gfx within a terminal?
The output of hwinfo --gfx is as follows
15: PCI 100.0: 0300 VGA compatible controller (VGA)
[Created at pci.386]
Unique ID: VCu0.vcvXg5y6ps7
Parent ID: mnDB.L2l2y4m79O6
SysFS ID: /devices/pci0000:00/0000:00:01.1/0000:01:00.0
SysFS BusID: 0000:01:00.0
Hardware Class: graphics card
Model: "nVidia TU116M [GeForce GTX 1660 Ti Mobile]"
Vendor: pci 0x10de "nVidia Corporation"
Device: pci 0x2191 "TU116M [GeForce GTX 1660 Ti Mobile]"
SubVendor: pci 0x17aa "Lenovo"
SubDevice: pci 0x3a46
Revision: 0xa1
Driver: "nvidia"
Driver Modules: "nvidia"
Memory Range: 0xd0000000-0xd0ffffff (rw,non-prefetchable)
Memory Range: 0x1ffc0000000-0x1ffcfffffff (ro,non-prefetchable)
Memory Range: 0x1ffd0000000-0x1ffd1ffffff (ro,non-prefetchable)
I/O Ports: 0x3000-0x307f (rw)
Memory Range: 0xd1080000-0xd10fffff (ro,non-prefetchable,disabled)
IRQ: 98 (192 events)
Module Alias: "pci:v000010DEd00002191sv000017AAsd00003A46bc03sc00i00"
Driver Info #0:
Driver Status: nouveau is not active
Driver Activation Cmd: "modprobe nouveau"
Driver Info #1:
Driver Status: nvidia_drm is active
Driver Activation Cmd: "modprobe nvidia_drm"
Driver Info #2:
Driver Status: nvidia is active
Driver Activation Cmd: "modprobe nvidia"
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #27 (PCI bridge)
28: PCI 500.0: 0300 VGA compatible controller (VGA)
[Created at pci.386]
Unique ID: Ddhb.a2V5Dhrwnb8
Parent ID: JZZT.e+TNXSUNut3
SysFS ID: /devices/pci0000:00/0000:00:08.1/0000:05:00.0
SysFS BusID: 0000:05:00.0
Hardware Class: graphics card
Model: "ATI Renoir"
Vendor: pci 0x1002 "ATI Technologies Inc"
Device: pci 0x1636 "Renoir"
SubVendor: pci 0x17aa "Lenovo"
SubDevice: pci 0x3a46
Revision: 0xc6
Driver: "amdgpu"
Driver Modules: "amdgpu"
Memory Range: 0x1ffe0000000-0x1ffefffffff (ro,non-prefetchable)
Memory Range: 0x1fff0000000-0x1fff01fffff (ro,non-prefetchable)
I/O Ports: 0x1000-0x10ff (rw)
Memory Range: 0xd1500000-0xd157ffff (rw,non-prefetchable)
IRQ: 65 (no events)
Module Alias: "pci:v00001002d00001636sv000017AAsd00003A46bc03sc00i00"
Driver Info #0:
Driver Status: amdgpu is active
Driver Activation Cmd: "modprobe amdgpu"
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #21 (PCI bridge)
Primary display adapter: #15
Seems your laptop has two graphics cards. Nvidia and AMD. What is the output of mhwd -li
The output of mhwd -li is
> Installed PCI configs:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
video-linux 2018.05.04 true PCI
video-hybrid-amd-nvidia-prime 2021.12.18 false PCI
Warning: No installed USB configs!
My guess is that the package xbacklight is installed. To my experience it only works with intel GPU.
Your active GPU is nvidia.
My suggestion is to install the package acpilight and add yourself to the video group
sudo pacman -Syu acpilight
sudo gpasswd -a $USER video
Restart your system
I installed the acpilight package, added myself to the video group, restarted, and the issue still persists
That is strange - I remember this recipe to work in the past.
If you run this and you get a permission error
xbacklight -10
Then add a sudo drop in to allow it to run
echo "%wheel ALL=(ALL) NOPASSWD:/usr/bin/xbacklight" | sudo tee -i /etc/sudoers.d/10-xbacklight
I ran xbacklight -10 and nothing happened—no change in brightness and no error message
Just to make sure I also ran
echo "%wheel ALL=(ALL) NOPASSWD:/usr/bin/xbacklight" | sudo tee -i /etc/sudoers.d/10-xbacklight
But still no change in backlight and no error received
I have found a solution to this ongoing issue. I did some digging and found that the problem can be solved by installing Optimus-Manager, allowing one to choose which GPU to use on the fly.
I have switched over to endeavourOS but this package will work for Manjaro as well.
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