My 20x04 5V HD44780 display arrived and I hooked it up to a Pi Zero W. 
I connected it to the GPIO pins given in Balázs' config file and used
the file as it is.
I also followed all other installation steps described in the wiki.

I get the display to light up and in the first and third line all pixels
are lit. Line 2 and 4 are dark.

I am, however, not getting anything else displayed. Not the welcome
message and not anything else.  
I checked all GPIO connections and can't find a problem there. 

lcdproc-server listens on port 13666 and I can talk to it with telnet. 

Is the 3v3 output of the pi zero not enough for the display understand
hi/lo?

What can I do the debug and hunt down my problem? 
Any help appreciated. 

Thx


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