Missing console on RasPi3 7” Touchscreen

[udoschneider]

Initial discussion on Elixir Forum: https://elixirforum.com/t/missing-console-on-raspi3-7-touchscreen/66393

Environment

• Elixir version (elixir -v):

  Erlang/OTP 27 [erts-15.1.1] [source] [64-bit] [smp:24:24] [ds:24:24:10] [async-threads:1] [jit:ns]
  Elixir 1.17.3 (compiled with Erlang/OTP 27)

• Nerves environment: (mix nerves.env --info)

  
  |nerves| Environment Package List
  
  No packages found
  |nerves| Loadpaths Start

|nerves| Precompile Start

|nerves| Precompile End

Nerves environment MIX_TARGET: host MIX_ENV: dev

NERVES_SYSTEM is unset NERVES_TOOLCHAIN is unset |nerves| Environment Variable List target: host toolchain: unset system: unset app: .

|nerves| Loadpaths End

* Additional information about your host, target hardware or environment that
  may help
 Target is rpi3 with Touchcreen

### Current behavior

The Raspi 7" Touchscreen stopped working with commit e0c89818e4192b469a502ee7e9cb480756ffef16.

### Expected behavior

Linux/Nerves console on screen

[udoschneider]

A quick check with the vc4-kms-dsi-7inch overlay added and

display_auto_detect=1
dtoverlay=vc4-kms-dsi-7inch

in config.txt didn’t yield any success.

Also, adding all the dtbos from https://github.com/raspberrypi/rpi-firmware/tree/master/overlays to the system did not work. My understanding of display_auto_detect is that if the appropriate DTO is available, then it should be working. My current assumption is that a module is missing. I will compare lsmod from Raspbian to Nerves next.