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graysky

Wiki Maintainer

From: :wq

Registered: 2008-12-01

Posts: 10,597

Website

Adjusting brightness on an Elitebook

Booting into gnome and hitting [Fn]+F9 or [Fn]+F10 shows an onsceen animation of the brightness level moving up and down but the actual brightness does not change.

% lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation GK104GLM [Quadro K4000M] (rev a1)

Using the nvidia driver gives a functional display.  I have tried using a few of the suggested grub options all of which have no effect or disable the [Fn]+x keys.

GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"
GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi="

Interestingly, I do see /sys/class/backlight/acpi_video0/brightness change when I use the [Fn]+x keys, it's just the actual brightness is unchanged.  Suggestions are welcome.

% cat /sys/class/backlight/acpi_video0/brightness
10

<< [Fn]+F9>>

% cat /sys/class/backlight/acpi_video0/brightness
9

Last edited by graysky (2016-12-24 15:59:36)

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Pyntux

Member

From: Serbia

Registered: 2008-12-21

Posts: 391

Re: Adjusting brightness on an Elitebook

Try to add this in to grub kernel line:

acpi_osi= acpi_backlight=native

acpi_osi= is followed by blank space....That worked for me....

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graysky

Wiki Maintainer

From: :wq

Registered: 2008-12-01

Posts: 10,597

Website

Re: Adjusting brightness on an Elitebook

No graphical response to the keys with the acpi_backlight=native switch by itself nor with used together as you suggested.

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CPU-optimized Linux-ck packages @ Repo-ck  • AUR packages • Zsh and other configs