Extended Monitor Resolution Problem with Dell Inspiron 6400 e1505 with intel Mobile 945gm chipset GMA 950 Driver

recently i bought a 2405fpw monitor to extend my workspace with my laptop which is dell inspiron 6400 e1505 with integrated graphics controller it is intel mobile 945gm chip set family with GMA 950 Driver. i am running on windows xp professional. my laptop only has VGA port. so connecting it with 2405fpw monitor.

the problem i am facing is that i could not able to get my external monitors to its native resolution 1920x1200 i am just getting 1280x768. windows xp display/setting some time shows maximum resolution as 1920x1200 but it quickly changes to 1280x768 as maximum resolution. but i could able to see 1280x768 resolution in the external monitor. some times external monitor goes to 1920x1200 resolution with pan mode (screen scroll automatically when mouse pointer reaches the edges)

intel 945gm datasheet shows that it can handle more than 1920x1200 resolution but i could not able to make it out. i tried everything idea i could get from forums/googling...i have updated BIOS/Graphics Drivers. even tried intel embedded graphics driver sdk...

have tried literally everything i am totally freaked out, any help would be highly appreciated...

 

Try hitting Fn+F8 to see if you can change the monitor mode. You appear to be in some kind of clone mode.

 

Thanks for the Quick Reply, Greg.

it is in Extended Mode Only. i tried Notebook+Monitor & Monitor+Notebook & just Monitor combination as well. No Luck in taking the External monitor to 1920x1200 resolution. refresh stays at 60hz i could not able to change refresh rate anywhere...

but extended mode works in different resolutions, My laptop goes upto 1280x800 and external monitor stops at 1280x768.