Hello everyone,
Today I saw a message suggesting to update to 5.10 kernel, and I happily did it, but now I cannot adjust my laptop’s screen backlight.
On Linux 5.9, I adjust the backlight by writing to the file /sys/class/backlight/nvidia_0/brightness
, and if I look at the nvidia_0
directory, it’s a symlink to another directory:
lrwxrwxrwx root root 0 B 5 minutes ago nvidia_0 ⇒ ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/nvidia_0
But when I boot using 5.10, my /sys/class/backlight
directory is empty.
On Linux 5.9, I have the following when I search for backlight
in /sys/devices
:
pci0000:00/0000:00:01.0/0000:01:00.0/backlight
platform/thinkpad_acpi/leds/tpacpi::kbd_backlight
But on Linux 5.10, I only have this:
platform/thinkpad_acpi/leds/tpacpi::kbd_backlight
I get this when I do mhwd -li
:
Warning: config '/var/lib/mhwd/local/pci/video-nvidia-455xx/MHWDCONFIG' is invalid!
> Installed PCI configs:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
video-nvidia 2020.11.30 false PCI
Warning: No installed USB configs!
I’m not sure what the warning is about, but on 5.9, I also get the warning, and the backlight works