About a tiny difference between Xfce4 and KDE (video).
 

Hi: I wrote an extensive post about this in the hardware forum but now, in the possesion of more data, the problem has been reduced to a simpler one: If I run Xfce4, I have only two screen resolutions: 640x480 and 800x600. But if I run KDE, I have the three resolutions specified in /etc/X11/xorg.conf.d/, namely 640x480, 800x600, 1024x768. Is this normal behaviour?

The screenresolution is configured in the X-server, not the WM or Desktopenvironment. KDE or Xfce only provide some buttons to set the resolution, maybe they lack some of the possible resolutions.

You don't need the gui for this configuration, use your keyboard, it has more keys than your mouse and is therefore more useful.

Markus

But it is precisely the GUI the thing affected by the resolution. If I want only one resolution, then I can write that resolution as the only one in the X config file. But sometimes, to watch a movie, I choose a higher resolution. Therefor in the config file I must at least two. _But I must be able to choose them from the GUI_, obviously.