Screen resolution won't stick after a reboot

I've got two debian systems sharing the same monitor through a Belkin
KVM switch. The monitor works fine on debianatGB, but the screen
resolution defaults to VGA every time I reboot the debianatAZV133. It
does not matter whether I use the KVM switch; I only mention it 'cuz
the monitor is one and the same between the two PC's, both running
debian (albeit installed at different times and with different setups).
Note also that the two video cards are from different vendors.

Here's the relevant section of /etc/X11/XF86-Config-4 on debianatGB
(which are the settings that hold the monitor's screen resolution OK):

Section "Device"
Identifier "Trident Microsystems TGUI 9660/938x/968x"
Driver "trident"
EndSection

Section "Device"
Identifier "NVidiaGForce"
Driver "nv"
EndSection

Section "Monitor"
# Block type: 2:0 3:fd
# Block type: 2:0 3:fc
Identifier "SyncMaster"
VendorName "SAM"
ModelName "SyncMaster"
# Block type: 2:0 3:fd
HorizSync 30-81
VertRefresh 56-75
# Max dot clock (video bandwidth) 140 MHz
# Block type: 2:0 3:fc
# Block type: 2:0 3:ff
# DPMS capabilities: Active off:yes Suspend:no Standby:no

Mode "1280x1024" # vfreq 60.020Hz, hfreq 63.981kHz
DotClock 108.000000
HTimings 1280 1328 1440 1688
VTimings 1024 1025 1028 1066
Flags "+HSync" "+VSync"
EndMode
# Block type: 2:0 3:fd
# Block type: 2:0 3:fc
# Block type: 2:0 3:ff
EndSection


Section "Monitor"
Identifier "Generic Monitor"
HorizSync 30-57
VertRefresh 43-72
Option "DPMS"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Trident Microsystems TGUI 9660/938x/968x"
Device "NVidiaGForce"
Monitor "SyncMaster"
# Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection

Section "DRI"
Mode 0666
EndSection
___________________________________________________________________

And here is what debianatAZV133's /etc/X11/XF86-Config-4 file says:

Section "Device"
Identifier "ATI Technologies Inc Rage 128 RF/SG AGP"
Driver "ati"
EndSection

Section "Monitor"
Identifier "Synchmaster 712N"
HorizSync 30-65
VertRefresh 50-75
Option "DPMS"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "ATI Technologies Inc Rage 128 RF/SG AGP"
Monitor "Synchmaster 712N"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1280x1024" "1280x960" "1152x864" "1024x768"
"800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1280x1024" "1280x960" "1152x864" "1024x768"
"800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x1024" "1280x960" "1152x864" "1024x768"
"800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1280x1024" "1280x960" "1152x864" "1024x768"
"800x600" "640x480"
EndSubSection
SubSection "Display"
SubSection "Display"
Depth 16
Modes "1280x1024" "1280x960" "1152x864" "1024x768"
"800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1280x960" "1152x864" "1024x768"
"800x600" "640x480"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
InputDevice "Generic Mouse"
EndSection

Section "DRI"
Mode 0666
EndSection
___________________________________________________________________

The resolutions that I'm running (1024 by 768 on the debianatGB PC
and 1280 by 960 on the debianatAZV133 PC) seem well within the
capabilities of the Samsung Synchmaster 712N LCD monitor, and the
monitor behaves OK once its screen resolution has been adjusted
after each reboot, but it seems odd to me that it won't stay put
during a reboot. I do notice that the screen resolution is OK on
the X login screen, but reverts to VGA after I log in. The screen
resolution also stays put OK on a third PC running Win98SE hooked
up through the same KVM switch.

Another clue is that the mouse gets lost every time I switch from
debianatGB back to debianatAZV133, freezing the debianatAZV133
effectively even though the keyboard survives the transition OK.
I've sent an inquiry to Belkin Tech Support about the mouse.

George Langford


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