xbacklight not working in ubuntu 16.10

Bug #1638136 reported by alim on 2016-10-31
This bug affects 22 people
Affects Status Importance Assigned to Milestone
xbacklight (Ubuntu)

Bug Description

After upgrading from 16.04 to 16.10 xbacklight is not working.
There happens nothing after executing inc or dec commands.

Running on:
- Thinkpad X240
- Ubuntu 16.10

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in xbacklight (Ubuntu):
status: New → Confirmed
alim (alimpam) wrote :

is there a workaround ? Because actually i cant set the brightness of my Notebook in i3-wm.

James Neill (jmsnll) wrote :

Also looking for a workaround if anyone has any suggestions?

lachmoewe (omg-lachmoewe) wrote :

As a workaround you could write a different value in /sys/class/backlight/intel_backlight/brightness. Requires root.

Dmitriy Geels (dmig) wrote :

xbacklight output: No outputs have backlight property

Dmitriy Geels (dmig) wrote :

Some sort of workaround:

1) add udev rule /etc/udev/rules.d/90-backlight.rules:
ACTION=="add", SUBSYSTEM=="backlight", RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness"
ACTION=="add", SUBSYSTEM=="backlight", RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness"

2) add yourself to group video: sudo usermod -a -G video $USER

3) run: sudo udevadm control -R && sudo udevadm trigger -c add -s backlight

Josh Bowen (skraelingjar) wrote :

I am using this script as a workaround for my keyboard buttons: https://github.com/Skraelingjar/bright but it's not perfect.

I also came across https://github.com/snobb/xbright

Josh Bowen (skraelingjar) wrote :

It is still not working for me in 17.04

zarej (zarej-svrljig) wrote :

You can use xfce4-power-manager it is working for me, plus you can have additional benefits like notification on battery low and few more things.

$ sudo apt install xfce4-power-manager

You can add automatically start on boot at ~/.config/i3/conf
exec xfce4-power-manager

Rohith Saradhy (rohithsaradhy) wrote :

Just use light instead...
Otherwise it is a mess to fix it, especially if you have intel and nvidia graphics together!

Brinstar (brinstar) wrote :

Experiencing this issue on a Dell Vostro 3300 with Ubuntu 16.04.3 (I know the OP has reported it on 16.10)

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