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xrandr --brightness doesn't work in Wayland.

Minimum brightness setting is scorching my eyes right now.

N0rbert
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Tom Mercer
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    A quick look at the Arch wiki suggests 2 applications which should work on Wayland: brightnessctl and acpilight. Might be well worth a look. Wiki page here: https://wiki.archlinux.org/index.php/backlight#Other_utilities – andrew.46 Oct 20 '17 at 10:21
  • "applications which work on Wayland" is not the same thing as "applications which turn brightness below minimum and work on Wayland". I'm looking for a solution to this specific problem, not any old backlight app. The answer below talks about /sys/class/backlight, which does not solve the problem. As far as I can read, acpilight and brightnessctl are just front ends to the manual commands like sudo su -c "echo 90 >/sys/class/backlight/*/brightness", which does not address the problem. I need to be able to set brightness down to something like .45, the way we could with xrandr pre-Wayland. – Tom Mercer Oct 21 '17 at 15:36
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    i have my manual monitor brightness and contrast down to 0 and it is still bright. the brightness controller app stopped working for me after upgrade from 17.04 to 17.10, and Settings > Power > Screen brightness slider does not change brightness :/ – user1063287 Oct 22 '17 at 11:01
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    Ubuntu has this page, but none of the directions work unfortunately: https://help.ubuntu.com/stable/ubuntu-help/display-brightness.html There have been several software updates since upgrading from 17.04 to 17.10 but they haven't solved the brightness problem. – user1063287 Oct 28 '17 at 08:02
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    /etc/gdm3/custom.conf:WaylandEnable=false is a way to switch to gdm on 17.10, where brightness controls work ! – Robert Riedl Feb 21 '18 at 12:24

1 Answers1

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Looks like there is no true solution.

Best alternatives are to use @Rober Riedl's comment and switch to gdm with /etc/gdm3/custom.conf:WaylandEnable=false, or wait and upgrade to 18.04, which will leave wayland because of its many problems.

I also installed some nighttime dimmers to somewhat reduce the brightness, but they're far from properly addressing this problem, too.

Tom Mercer
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