Ubuntu 19.10 64 bit will not boot when fan shim is attached


This issue was metioned previously here: Fan Shim will not allow RPI4 to boot [SOLVED]

I wanted to open a separate thread because the older one was marked as resolved for another reason.

I have 2 raspberry pi’s with ubuntu server 19.10 64 bit installed. both of them fail to boot most of the time with fan shim attached. i don’t have hdmi cable so i am not sure what goes on there.

in rare cases pi can boot. also if i boot first then attach the fanshim, it works (of course: do not try this)

  • i tried full-upgrade
  • i tried disabling uart
  • fanshim service being installed or not does not have any effect