How to set the screen resolution and gamma value?

Kevin Krammer krammer at
Wed Jan 16 15:00:25 GMT 2013

On Wednesday, 2013-01-16, Volker Wysk wrote:
> Hello!
> I've updated from KDE 4.4 to KDE 4.8.4, and now I can't set the screen's
> resolution any longer. There's only one choice: 1920*1440. With this, the
> screen flickers, especially when the background is bright. In addition, the
> font in the menu bars is so small, I can hardly read it.
> "xrandr -q" yealds:
>    xrandr: Failed to get size of gamma for output default
>    Screen 0: minimum 1920 x 1440, current 1920 x 1440, maximum 1920 x 1440
>    default connected 1920x1440+0+0 0mm x 0mm
>       1920x1440       0.0*

This looks like there were some changes in your system base setup, i.e. not 
related to the KDE update itself.
As we can see here the Xserver reports that it can only do one resolution, so 
any KDE tool can not offer anything else.

> A related problem is, that the gamma value of the screen can't be set any
> longer. In KDE 4.4, I've set it in /etc/X11/xorg.conf:


> This no longer works. In the system settings (Systemeinstellungen) I
> haven't found a control to set the gamma value.

This again looks like some change unrelated to the KDE update is at fault but 
more likely something related to the Xserver (or display driver, etc).

Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring
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