dual monitors

Open andrewufrank opened this issue 4 years ago • 5 comments

The Raspian OS and the ubuntu 20 installation makes use of the dual monitor capability. I tried to install Debian with the netbios bullseye downloaded (following the instructions from akeo and then installed Debian Mate, expecting to use the dual monitors (as I do with the Ubuntu installation). Unfortunately, only a single monitor is currently usable. There are perhaps some tweaks missing (dtoverlay=vc4-fkms-v3d ? but where to include?) or some more software? Any suggestions and help would be appreciated - the dual monitor capability of the RPi4 is a novel feature for a SBC and a regular Debian installation should be capable of using it? Thank you!

Feb 26 '21 23:02 andrewufrank

I have added now the dtoverlay=vc4-kms-v3d to the config.txt and moved the the vc4-kms-v3d.dtbo into the overlays folder in /boot/efi. xrand does not show the hdmi monitors (just screen). what else is missing?

Feb 27 '21 09:02 andrewufrank

You might note: https://github.com/pftf/RPi4/issues/127

Mar 03 '21 22:03 jlinton