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phisch

Member

Registered: 2017-03-28

Posts: 1

[xbacklight] No outputs hae backlight property

Hey Guys,
As many other I'm having problem with xbacklight.
Stuff I know:

path for brightness:
  /sys/class/backlight/intel_backlight/brightness
manual writing and reading to and from this file changes background brightness

I tried changing boot options to
  acpi_backlight=vendor | none | native
nothing changed

I tried creating a file
  "xorg.conf" in /etc/X11/
which prevented xserver to start

then I moved it to
  xorg.conf.d/10-backlight.conf
which prevented xserver to start

the file reads:
  Section "Device"
      Identifier  "Card0"
      Driver      "intel"
      Option      "Backlight"  "intel_backlight"
  EndSection

I would be happy if you could help me :)

hynner

Member

Registered: 2016-02-18

Posts: 20

Re: [xbacklight] No outputs hae backlight property

I also had this problem, but putting the config you mentioned into xorg.conf.d solved it for me. I have  kcpi_backlight=native as a kernel parameter, but I don't know if it matters. Anyway you should post the Xorg log if you say that X wouldn't start with this config.

Docbroke

Member

From: India

Registered: 2015-06-13

Posts: 1,433

Re: [xbacklight] No outputs hae backlight property

Are you using modesetting driver? xbacklight doesn't work with that (known bug).

Last edited by Docbroke (2017-04-11 01:34:28)

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step

Member

Registered: 2016-05-09

Posts: 56

Re: [xbacklight] No outputs hae backlight property

I have the same problem in modesetting, if i try to use with xf86-video-intel it's works but i can't install it cause it freeze befor login and i don't know how i can resolve it. Someone have solution for this?

Edit:
I have solved with acpi_backlight, but when i try to use it into i3wm it's don't work; when i lauch xbacklight -dec 10 in terminale it require sudo, why in i3 it don't work?

Last edited by step (2017-04-11 11:45:27)