Pi 4 No VNC screen if booted without monitor - Fix

[stan_qaz]

I dug the information here out of several other posts and thought having it together with a title that might make it easier to find for folks with VNC issues would be good.

My Pi 4s would boot up just fine with a monitor connected and I could also VNC into them with no issues. However, with no monitor connected I at boot I could no longer VNC in, ssh still worked though. VNC did connect but showed a "No Screen to Display" error.

To force the video system to start with no monitor connected:

Edit: /boot/config.txt

Change these lines to look like this: ( The 2 : 0x53 gives you a working 1600 x 900 option that works good on a 1980x1080 screen )

Code: Select all

# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=0x53

Then set your preferred resolution with the screen tool and reboot.

HDMI Group and Modes list and much other good information:

viewtopic.php?f=28&t=5851