I have run into an intermittent issue with the 7" RPi screen whereby the unit will sometimes not be recognized at startup if it is powered using the micro-usb and both the Pi and the Screen are powered on at the same moment (ie if power supply has on/off for both). I assume this is because the screen may take a second or so to fully power on perhaps? And in the interim it goes unrecognized by the Pi?
I have tried setting a boot_delay of up to 8 seconds in the config, but that only seems to have made it a little less often, but hasn't eliminated it completely.
The problem goes away if I power the unit via the GPIO, but my setup makes this less than optimal due to power needs.
Appreciate any advice. Thanks.