Portsdown software 201902072 (just released) supports both the 7 inch screen and the 3.5 inch screen with no need to set the display type beforehand. It also provides the tools to check your LimeSDR Mini and to load the correct firmware and gateware for the Portsdown no matter what was loaded on the LimeSDR Mini beforehand. See "Lime Config" on Menu 3.
Additionally, it includes the facility to back-up and restore your Portsdown configuration from either a USB stick, or the /boot partition of your SD Card. You can invert the 7 inch display (for the older housings) and enable the hardware shutdown button from the "System Config" menu on Menu 3.
The C920 should now happily co-exist with a Pi Camera, and it is possible (at the expense of some occasional audio clicks) to set the RPi so that you can transmit using the Filter-Modulator board after using the RPi audio output. See the "force pwm open = ?" button on the System Config menu.
Whilst there are number of minor bugs and additional features that I would like to sort out, the 2 things that I will now concentrate on are curing the partial test card display in H264 with DATV Express, and increasing the available symbol rate in MPEG-2 with the Lime SDR Mini.
Full additional feature list for 201902072:
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Automatic driver switch and reboot for 7 inch screen C920 driver load after boot (can now co-exist with Pi Cam) Reboot and Rotate function for 7 inch screen Hardware ShutDown Button can be enabled from touch screen Save to USB updated and available from touchscreen Save settings to /boot added Lime selection from Console Lime Test Report from Touchscreen Force Lime FW update added to touchscreen Toggle force_pwm_open facility to enable TX after sound use USB sync not disabled on initial install Fix for KeyedTX bug