The brightness slider does not change the brightness on my laptop (Acer Aspire 4810T, Intel integrated graphics). Looking around, the closest thread that I found was this. Adding
"acpi_backlight=vendor acpi_osi=linux" to
/etc/default/grub (as suggested here) did not work, and neither did creating
/etc/X11/xorg.conf.d/10-brightness.conf. Using the
xrandr command does work:
xrandr --output LVDS-1 --brightness 1.0
Though this understandably only works when I am using X, not Wayland.
What could possibly be done to fix this?