How do I deactivate the X11 video device auto-settings?

[Bob]

On Sun, 23 Mar 2008 14:15:33 +1030
Tim <ignored_mailbox at yahoo.com.au> wrote:

> On Sat, 2008-03-22 at 07:07 -0500, pursley1 at netscape.net wrote:
> > I need to know if someone can tell me that will force X11 to default
> > to a specific display mode (24 bit color w/ 1024x768 resolution) when
> > it starts up.  I am using an LCD display that is not very forgiving in
> > other graphic video modes and for some reason, even though I have that
> > listed as the only option in xorg.conf, it still switches to another
> > video mode when it first starts up.
>
> You *might* want to play with the DDC option in your xorg.conf, to stop
> it probing your hardware for settings, so it just uses what you,
> configure yourself.
>
> e.g. Option "DDC" "off"
>
> You can try reading the man files for your graphics chipset, e.g. "man
> i810" (substituting whatever yours actually is), but I've found that
> some of the options mentioned in these man files were completely
> ignored.
>
Environment:
  Fedora 8
  xorg-x11-drv-nv-2.1.6-1.fc8
  Nvidia NV34 [GeForce FX 5200] (rev a1) connected with
  digital to analog converter (supplied by card vendor)  to Compaq KVM
  (don't know exact model) to (analog to analog) Dell FP2405FPW LCD monitor.

This solved my problem.
On FC4 everything was working properly.
On F8 i tried nvidia proprietary driver and it worked only in 1920x1080.
With nv driver and this setup i got 1920x1200 back again :-)

Section "Monitor"
    Identifier   "Monitor0"
    VendorName   "Monitor Vendor"
    ModelName    "Dell 2405FPW (Analog)"
    HorizSync    30.0 - 83.0
    VertRefresh  56.0 - 60.0
    Option      "dpms"
    Option       "DDC" "off"
    Option       "ReducedBlanking" "on"
    ModeLine     "1920x1200" 154.0 1920 1968 2000 2080 1200 1203 1209 1235
+hsync -vsync
    ModeLine     "1600x1200" 161.0 1600 1704 1880 2160 1200 1201 1204 1242
-hsync +vsync
    ModeLine     "1280x1024" 138.5 1280 1368 1504 1728 1024 1025 1028 1069
-hsync +vsync
    ModeLine     "1152x864" 105.0 1152 1224 1352 1552 864 865 868 902 -hsync
+vsync
    ModeLine     "1024x768" 81.8 1024 1080 1192 1360 768 769 772 802 -hsync
+vsync
    ModeLine     "800x600" 48.9 800 840 920 1040 600 601 604 627 -hsync
+vsync
    ModeLine     "640x480" 30.7 640 664 728 816 480 481 484 502 -hsync
+vsync
EndSection

Tnx for the tip & best regards, Bob
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