[OTHER] vnc | camera legacy about picamera2 HOT 4 CLOSED

Does not belong here since it has nothing to do with picamera2.

Anyway here an answer:
When you enable Legacy Camera support in bullseye it replaces the KMS driver with the previously used
fake KMS driver (dtoverlay=vc4-fkms-3d instead of dtoverlay=vc4-kms-3d in /boot/config.txt).
If you are running headless then you get the cannot connect ....
When using the fkms driver you have to use the legacy hdmi options in /boot/config.txt:
hdmi_froce_hotplug, hdmi_group, hdmi_mode to force a resolution for vnc.
Check you have the latest realvnc server (6.9.1) installed.
WIth the legacy hdmi options I get a proper desktop on a headless pi4 with legacy camera support enabled.

from picamera2.

thanks for reply,

so i activate legacy and change dtoverlay in /boot/config.txt - thats it?

from picamera2.

The dtoverlay change is done by raspi-config when you enable Legacy Camera support.
You only have to set the proper hdmi options in /boot/config.txt. They are commented out in the default /boot/config.txt

from picamera2.

great it worked! love you

from picamera2.