On 2-Dec-07, at 10:03 PM, Donnie Berkholz wrote:

On 23:58 Sat 01 Dec     , Joe wrote:

Section "Screen"

        Identifier    "Default Screen"
        Device        "Intel 945G"
        Monitor       "Builtin"

        DefaultDepth  24

        SubSection "Display"
                Depth         24
                Modes         "1280x800"  "1024x768"   "640x480"
                Virtual       2048 2048
        EndSubSection

EndSection

Section "Screen"

        Identifier    "External Screen"
        Device        "Intel 945G"
        Monitor       "External Monitor"

        DefaultDepth  24

        SubSection "Display"
                Depth         24
                Modes         "1920x1200" "1600x1200" "1680x1050"
"1024x768"   "640x480"
                Virtual       2048 2048
        EndSubSection

EndSection

Section "ServerLayout"
        Identifier "Dual Layout"
        Screen 0 "Default Screen"
        Screen 1 "External Screen" Above "Built-in Screen"

        Option "Clone" "On"
        #Option "Xinerama" "On"

        InputDevice "Generic Keyboard"
        InputDevice "Configured Mouse"
EndSection

You've still got a mixed combination of old and new setups. You should
only have one screen section, and your serverlayout section should not
have two screens or anything related to dual screens in it (clone
option). After making that change, I suppose you'll need to list all the
modes you care about for either monitor in the single screen section.
Thanks again. Looks like I'm getting close, because now dualscreen works correctly! Unfortunately, I still haven't been able to get the monitor to use 1920x1200 mode with the reduced blanking option turned on. I even tried using cvt like you recommended in your first reply:

cvt -r 1920 1200 60hz
# 1920x1200 59.95 Hz (CVT 2.30MA-R) hsync: 74.04 kHz; pclk: 154.00 MHz
Modeline "1920x1200R" 154.00 1920 1968 2000 2080 1200 1203 1209 1235 +hsync -vsync

and then did a xrandr newmode/addmode, but I still get the "out of range signal" error when I try to switch to 1920x1200R. Thanks again for your help,

Joe
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