Again my apologies to everyone for hijacking this thread, But since
people are asking, and I was able to solve the backlight problem after
days of pain, here are the instructions. Two caveats though:
- you need to have the laptop in "Discrete" mode in the BIOS (in my experience,
Hybrid mode gives little battery life advantage, even in Windows)
- the instructions below are for Debian, but the only different thing to have
in mind is the /experimental release in the apt install command, which should
be adapted to the Ubuntu release you want to install the drivers from
1. make sure that you remove all nvidia stuff:
apt --purge remove nvidia*
(this includes any nvidia configuration files in /etc/X11/xorg.conf.d)
2. install the proprietary nvidia driver version you want (replace experimental
with the target release)
sudo apt install libegl-nvidia0/experimental
libgl1-nvidia-glvnd-glx/experimental libglx-nvidia0/experimental
libnvidia-eglcore/experimental libnvidia-glcore/experimental
libnvidia-ml1/experimental nvidia-alternative/experimental
nvidia-driver/experimental nvidia-driver-bin/experimental
nvidia-driver-libs/experimental nvidia-egl-common/experimental
nvidia-egl-icd/experimental nvidia-kernel-dkms/experimental
nvidia-kernel-support/experimental nvidia-modprobe/experimental
nvidia-vdpau-driver/experimental xserver-xorg-video-nvidia/experimental
libgles-nvidia1/experimental libgles-nvidia2/experimental
nvidia-vulkan-icd/experimental libnvidia-cfg1/experimental
libcuda1/experimental libnvcuvid1/experimental libnvidia-encode1/experimental
nvidia-opencl-icd/experimental nvidia-smi/experimental
libnvidia-cbl/experimental libnvidia-rtcore/experimental
nvidia-cuda-mps/experimental libnvidia-ptxjitcompiler1/experimental
libnvidia-compiler/experimental libnvidia-glvkspirv/experimental nvidia-settings
3. create a file /etc/X11/xorg.conf.d/21-nvidia-brightness.conf with the
following contents:
Section "OutputClass"
Identifier "nvidia"
MatchDriver "nvidia-drm"
Driver "nvidia"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
4. reboot and backlight control should be working!
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https://bugs.launchpad.net/bugs/1887190
Title:
MSFT Touchpad not working on Lenovo Legion-5 15ARH05
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