When I set the Pi (Zero) up with the required 640x480 60Hz mode in config.txt the SV-3 reports no signal.
But if I plug a VGA Acer monitor in to the Pi and then unplug it, plugging in the SV-3 works!
I am using a standard micro HDMI->HDMI converter with a HDMI->VGA converter (Branded Pi-Hut)
In the config.txt I have tried various combinations of
hdmi_safe=1 hdmi_ignore_edid=0xa5000080 hdmi_group=1 CEA hdmi_mode=1 VGA 640x480 hdmi_mode=2 480p hdmi_mode=3 480p H hdmi_group=2 DMT hdmi_mode=4 640x480 60 Hz
Then I tried plugging in the Acer monitor and running
/opt/vc/bin/tvservice -d edid.dat
putting edid.dat into /boot and setting the
I also compared the edid.dat when just the SV-3 was plugged in vs the Acer monitor (links to files at the end)
for either VGA device gives
state 0x12000a [HDMI DMT (4) RGB full 4:3], 640x480 @ 60.00Hz, progressive
and running X and then randr from a VT for both devices gives
xrandr: Failed to get size of gamma for output default Screen 0: minimum 576 x 416, current 576 x 416, maximum 576 x 416 default connected 576x416+0+0 0mm x 0mm 576x416 0.00*
get-edid always reports nothing on the i2c bus
So I know it is the Pi doing something to the HDMI output when I plug in the Acer monitor that makes the SV-3 work when it is plugged in afterwards. But it does not seem to be the edid so I am at a complete loss as to what to try now.
This is a strange setup so I appreciate any answers or ideas.