How to set the screen resolution and gamma value?

Felix Miata mrmazda at
Wed Jan 16 14:50:44 GMT 2013

On 2013-01-16 15:18 (GMT+0100) Volker Wysk composed:

> 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.

What distro? What Xorg version? What output from 'lspci | grep VGA'? Which 
video driver shows in use in /var/log/Xorg.0.log? Exactly how/where did you 
set it before? Are you saying krandrtray no longer works?

>  In addition, the
> font in the menu bars is so small, I can hardly read it.

You may want to try forcing DPI as an overall scaling factor if you don't 
like specifying fonts in the desktop font settings panel in systemsettings. 
With most drivers, DisplaySize can do it. Look at for examples. For proprietary NVidia 
drivers it can be done a bit more directly.

> "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*

> In KDE 4.4 I was able to set the screen's resolution.

Last I checked it still does, though I almost never do it in the DE itself, 
preferring to use an xorg.conf* solution instead, where PreferredMode is the 
keyword. Check out the xorg.conf* files on for 
basic examples, and note that config files are for overriding automagic, 
which few need for mouse or keyboard any more. It's better to leave unneeded 
overrides out of config files.
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***
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