Arch Linux

jiehanzheng

Member

Registered: 2013-03-02

Posts: 15

Unable to lower brightness to below 95% in GNOME 3 using Fn keys

Hello,

I just installed GNOME 3 and this is a relatively fresh Arch install.  I am using a ThinkPad X1 Carbon.

The problem I am having is that, the Fn+F8, Fn+F9 brightness control keys are not having significant effects.  When I press Fn+F8, the GNOME shell brightness OSD does appear, and the bar does go down a bit, but it won't go anywhere lower even if I keep pressing Fn+F8.  And when I run

[jiehan@tpx1c ~]$ /usr/lib/gnome-settings-daemon/gsd-backlight-helper --get-brightness
95

It is always 95.  Using Fn+F9 to raise the brightness, I am able to get 100.

This is very awkward.  I want to be able to set my brightness to something lower than 95 using keyboard shortcuts!

However, I am able to lower the brightness to < 95 by issuing the following, and it works:

[jiehan@tpx1c ~]$ sudo /usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 50
[sudo] password for jiehan: 
[jiehan@tpx1c ~]$ /usr/lib/gnome-settings-daemon/gsd-backlight-helper --get-brightness
50
[jiehan@tpx1c ~]$ 

If you have any idea on getting the keyboard shortcuts to work, please let me know.  Thank you!

Last edited by jiehanzheng (2013-03-20 18:56:52)

WonderWoofy

Member

From: Los Gatos, CA

Registered: 2012-05-19

Posts: 8,414

Re: Unable to lower brightness to below 95% in GNOME 3 using Fn keys

There are a number of threads right now about Intel graphics and a bit of wonky-ness with the 3.8.3 kernels (and earlier it seems as these threads date back into Feb).  Please search the threads for other relevant stuffs.

jiehanzheng

Member

Registered: 2013-03-02

Posts: 15

Re: Unable to lower brightness to below 95% in GNOME 3 using Fn keys

Thanks for the information...  I just subscribed to this:
https://bbs.archlinux.org/viewtopic.php?id=158775

I will see if these are related.

Last edited by jiehanzheng (2013-03-21 14:03:05)