When no monitor connect , the resolution can only be 1920 * 1080 in 30hz?
Are you connecting a monitor or a TV?
Below are some methods that could perhaps solve the problem, singly or several together :
Method 1 : Use a tool to force the resolution
Here are some command line tools that can change the screen resolution :
QRes, NirCmd, Display Changer.
Method 2 : Registry updates
Search the registry for DefaultSettings.XResolution
, DefaultSettings.YResolution
and BitsPerPixel
and change
to the desired resolution.
If necessary, add ColorDepth for RDP connection :
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services] "ColorDepth"=dword:00000003 in decimal.
More info can be found here.
Method 3 : Setting the video adapter to custom setting
If your VGA video driver has customizing software, you could do something similar to:
Method 4 : Use a fake video plug
If it becomes necessary to fool Windows into believing that a real monitor is attached, see this tutorial on how to create such a plug using a spare DVI-VGA adapter and three 68 ohm resistors: The 30 Second Dummy Plug.
Method 5 : Use PowerStrip (shareware, $29.95)
The PowerStrip utility allows you to gain complete control over the video card.
For more details see :
Customize monitor resolution settings with PowerStrip.