Adjust backlight brightness of a HDMI connected monitor (desktop)

manuelschneid3r · 2014-12-30 13:12:30

Hi,

my Intel i5 4th gen shows a backlight. This is a desktop CPU and my chipset suppports 3 outputs DVI, HDMI, DP (msi b85i). Afaik none of them supports backlight stuff. Why do I get this entry:

;) .:[ manuel@b85i ]:. ~ $ ls /sys/class/backlight
acpi_video0

The permanent KDE backlight changes, having no effect to the brightness, start to annoy me. Is this normal behaviour or is my system misconfigured?

Last edited by manuelschneid3r (2015-02-07 16:55:20)

Head_on_a_Stick · 2014-12-30 13:15:04

Presuming you are using an integrated Intel graphics card, you may need to add this kernel parameter:

video.use_native_backlight=0

or maybe "=1" (YMMV)
https://wiki.archlinux.org/index.php/Backlight

manuelschneid3r · 2014-12-30 21:33:10

I read that since 3.16 "0" is default. "1" causes KDED (Kde Daemon) to crash, but the entry is still there. Why is it there at all?

Head_on_a_Stick · 2014-12-30 22:12:07

Either value may be needed -- it is hardware-dependent.

manuelschneid3r · 2015-02-07 16:54:14

Hmm, let me ask this another way: What should happen, if I add "video.use_native_backlight=0" ? Yes I use the integrated intel GPU. (I have none else)

Last edited by manuelschneid3r (2015-02-07 16:56:37)

Arch Linux

#1 2014-12-30 13:12:30

Adjust backlight brightness of a HDMI connected monitor (desktop)

#2 2014-12-30 13:15:04

Re: Adjust backlight brightness of a HDMI connected monitor (desktop)

#3 2014-12-30 21:33:10

Re: Adjust backlight brightness of a HDMI connected monitor (desktop)

#4 2014-12-30 22:12:07

Re: Adjust backlight brightness of a HDMI connected monitor (desktop)

#5 2015-02-07 16:54:14

Re: Adjust backlight brightness of a HDMI connected monitor (desktop)

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