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I have a Windows 10 desktop that I run headless. When I plug in a display, it correctly uses that display's native resolution. When I disconnect the display and connect to the computer over VNC, the resolution is locked to 1024x768. There are several places to adjust the resolution (classic Control Panel, new Settings panel, Nvidia control panel) but all fail with various errors along the lines of "settings could not be saved."

Is it possible to change the display resolution to something under than 1024x768 when running headless?

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I experienced something similar when trying to stream from a computer that only had network and power connected; here's what worked for me (source):

  1. Open regedit, navigating to
    HKLM\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration
    
  2. Select key starting with SIMULATED, then child key 00
  3. Change the decimal value of PrimSurfSize.cx to the desired horizontal resolution (i.e 1920)
  4. Change the value PrimSurfSize.cy to the desired vertical resolution (i.e. 1080)
  5. Change the value Stride (for 1920x1080 this is 7680: ((1920 * 32 + 7) / 8))
  6. Select the child key of 00, also named 00, and change ActiveSize.cx to the same horizontal resolution value above
  7. Change the value of ActiveSize.cy to the same vertical resolution above
  8. While you can change the other values in this key that are set to 1024 and 768, I haven't noticed an impact.
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