Wavy Screen using 'Option "Display" "CRT"' on ATI 128 Rage Mobility

[Daniel Farnsworth Teichert <danielt@ee.byu.edu>]

I've sent the following message to a couple of the XFree86
mailing lists, and haven't got much back--maybe someone
here can help? Thanks.

I've been working on a Dell Latitude C600 with an
ATI Rage 128 Mobility LF (or something like that).
I want to be able to start X up on an external
monitor (as opposed to switching using the FN-F8
key combo after X has already started on the LCD).
My understanding was that adding the
Option "Display" "CRT" line to the Device section
would do this--and indeed it does, except that
instead of starting up clear (like the screen
looks if I switch over using the FN-F8 combo),
it's all wavy and jittery--not flicker such as
you get with a low refresh rate, but more like
every other or every third line of pixels is moving
from side to side very rapidly, or something.

Like I said, if I use the CRT/LCD button to switch,
it works fine. But I want to be able to start up
on the CRT so that I can get a better resolution
and refresh rate. Any ideas? Thanks in advance--

  --Daniel

P.S. I'm running Debian GNU/Linux unstable,
XFree86 4.1.0.1 (according to X -version) on
kernel 2.4.9. Here's my XF86Config. Let me know
if you need more info or have an idea.

XF86Config:

Section "ServerLayout"
        Identifier     "XFree86 Configured"
        Screen      0  "Screen0" 0 0
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
        RgbPath      "/usr/X11R6/lib/X11/rgb"
        ModulePath   "/usr/X11R6/lib/modules"
        FontPath     "/usr/X11R6/lib/X11/fonts/misc/"
        FontPath     "/usr/X11R6/lib/X11/fonts/Speedo/"
        FontPath     "/usr/X11R6/lib/X11/fonts/Type1/"
        FontPath     "/usr/X11R6/lib/X11/fonts/CID/"
        FontPath     "/usr/X11R6/lib/X11/fonts/75dpi/"
        FontPath     "/usr/X11R6/lib/X11/fonts/100dpi/"
EndSection

Section "Module"
        Load  "dbe"
        Load  "dri"
        Load  "extmod"
        Load  "glx"
        Load  "pex5"
        Load  "record"
        Load  "xie"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "keyboard"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "GlidePointPS/2"
        Option      "Device" "/dev/psaux"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "HWP"
        ModelName    "HP75"
        HorizSync    30.0 - 86.0
        VertRefresh  50.0 - 160.0
EndSection

Section "Device"
        Option      "Display" "CRT"
        Identifier  "Card0"
        Driver      "ati"
        VendorName  "ATI"
        BoardName   "Rage 128 Mobility LF"
        BusID       "PCI:1:0:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Card0"
        Monitor    "Monitor0"
        DefaultDepth 24
        SubSection "Display"
                Depth     24
                Modes     "1280x960"
        EndSubSection
EndSection