Meta-radxa and X11 configuration

I’m trying to build an X11 image rockpin10 (using meta-radxa) that has a custom LCD display interfaced via DSI. The display shows up fine (I can see a desktop), but I’m not able to rotate the display correctly. I’m guessing it’s because I don’t have the correct modesettings?
For example, if I run:

DISPLAY=:0 xrandr

The output is

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 720 x 1280, current 720 x 1280, maximum 720 x 1280
default connected 720x1280+0+0 0mm x 0mm
720x1280       0.00*

I was expecting something like this, which I got from the debian build process:

Screen 0: minimum 320 x 200, current 720 x 1280, maximum 8192 x 8192
DSI-1 connected primary 720x1280+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
720x1280      60.59*+  60.59 

Anyone help would be greatly appreciated!