cannot adjust screen brightness only as root - some privileges problem

asked 2018-11-23 13:20:25 -0500

roberto68
41 ●2 ●5 ●8

updated 2018-11-26 02:44:20 -0500

I cannot change screen brighntess whether it is via g panel, xfce panel, xrandr, xbacklight or keyboard. I start gnome session as root and it worked so defo problem with privelieges. I pasted ls-l of a folder which /sys/class/backlight/intel_backlight symlink points at (where the actual files are /sys/devices/..../intelput it on pastebin caus of better format option https://pastebin.com/DipG5TVS I've also created /etc/udev/rules.d/backlight.rules and added those lines

 ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="intel_backlight", RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness"
ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="intel_backlight", RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness"

according to the https://wiki.archlinux.org/index.php/... but that doesn't do anythign about that Thanks Rob

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answered 2018-11-24 10:54:20 -0500

ed209
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Well, only root can change stuff in /sys, of course. But if you add your user to video group the rules you've written could work.

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I did that but I got No outputs have backlight property so according to this I uncomented and edited this line Option "Backlight" intel_backlight in /etc/X11/xorg.conf but this could only work under Xserver doesn't work with wayland obviously

roberto68 ( 2018-11-26 03:03:31 -0500 )edit

Your solution seems acceptable. Better not mess around, and I doubt very much you could modify wayland in this sense anyway.

ed209 ( 2018-11-26 08:31:04 -0500 )edit

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answered 2018-11-27 16:21:53 -0500

roberto68
41 ●2 ●5 ●8

so I "solved it" (bypass is a better word) I installed cockpit and I'm using it in icecat (limited to localhost) and use this solution https://askubuntu.com/questions/93887... So I am running that script thru root terminal which cockpit provides (I cannot login as root in "normal terminal"). Quite hacky but it works :D

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cannot adjust screen brightness only as root - some privileges problem

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