I'm trying to get a 320 * 240 LCD display working via the DPI interface, and have stumbled across a strange problem - if I use the following for testing the Pi3 video signal output:
...I see signals on PCLK, HSYNC, VSYNC. But if I use this:
...there are no signals. Both are standard DMT modes, so why the lack of signals in the latter config?
I also see no signals when I try to use dpi_output_format/hdmi_timings for a custom mode, but am hoping that understanding the issue with dpi_mode=4 will shed light on things...