ubuntu 20.04 ubuntu-desktop dual hdmi output

[huangchinlin]

Hi, there,

I've installed ubuntu 20.04 preinstalled image and ubuntu-desktop on pi4b, and each HDMI can work well independently but dual output in the meantime is not working.
Could someone help me to modify some settings with CLI so dual output can work?

Thank You.

Br,
Huangchin.

[humbug]

Hi,
Try adding dtoverlay=vc4-fkms-v3d to /boot/firmware/usercfg.txt followed by a reboot.
After I applied this to my system both screens became active.

John

[huangchinlin]

Thank you, John.
It's working.