My screen brightness doesn't work as many others have reported. So I dug around...
https://wiki.archlinux.org/title/backlight
The following ls /sys/class/backlight
generates two entries:
acpi_video0 radeon_bl0
This does nothing:
echo 20 > /sys/class/backlight/acpi_video0/brightness
This however does:
echo 20 > /sys/class/backlight/radeon_bl0/brightness
It makes me think the brightness control is targeting the wrong one. How can I fix this?
Ok so this solved it.
Run:
sudo nano /etc/default/grub
Add acpi_backlight=vendor
to GRUB_CMDLINE_LINUX_DEFAULT
and GRUB_CMDLINE_LINUX
so it looks like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
Save and and update grub:
sudo update-grub
Reboot and disco.
Fix this in installation. Or at the very least add it to the FAQ. This was way to hard to figure out.
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