Finally, I found what I need:
Using xrand -s 2 switches to   1024 x 768,
xrand -s 0 switches back.

Any way to put this behaviour into XF86config to use CRTL+ALT+(NUM+) ?
   Andreas

Andreas Krebs wrote:
I did the following modification, but it still the same:
The virtual res. remains 1400x1050 when switching to the lower
resolution, i.e., moving the mouse to display's border shows the hidden part of the 1400x1050 virtual pixels. Thanks Andreas

Section "Screen"
#  DefaultDepth 16
  SubSection "Display"
    Depth      24
    Modes      "1400x1050" "1024x768" "800x600" "640x480"
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection

Section "Device"
  BoardName    "Unbekannt"
  Driver       "r128"
  Identifier   "Device[0]"
  Option       "dpms"
#  Option        "CRTScreen" "false"
  Screen       0
  VendorName   "Unknown"

Michael Taylor wrote:

Andreas Krebs wrote:


Now, I would like to get rid of the virtual resolution 1400x1050
when I am working with 1024x768.
Is there a way to switch the virtual resolution on the fly or
do I need to start a second Xserver.



If I understand your request, yes. You just need to simplify your Section "Screen" entry in your XF86Config file.

Something like (you may need/want multiple display depths):

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Depth     24
        Modes      "1400x1050" "1024x768" "800x600" "640x480"
        EndSubSection
EndSection
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| Andreas Krebs                                            |
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