I have Ubuntu MATE on my rPi3, attached to my TV with a HDMI-to-VGA adapter (j5create model JDA213). This is a powered adapter, and I am using a 2.3a/12w USB power plug for the video adapter. If the Pi is attached to an HDMI port the video comes up fine. But I get NO video using the video adapter. The Pi is booting, because I can SSH into it and run a VNC session on it.
I’m presuming there must be come configuration tweaks on it, but apparently no one else s using his adapter on the rPi.
Try getting to a commandline,aand issuing the command
tvservice -s
this should show what the system thinks is connected - I suspect it is switched to analog mode as a result of not detecting a hdmi connection.
It should then be possible (by means of /boot/config.sys) to convince it otherwise, and supply suitable parameters
It now occurs to me I may have made the wrong assumptions from your posting - which end of the connection is hdmi, and which vga?1
HTH
Derek
I have this:
RPI3/HDMI -> JDA213 adapter -> VGA input on TV
with the settings "hdmi_safe=1" and "hdmi_force_hotplug=1" the tvservice command shows
state 0x120009 [HDMI DMT (4) RGB full 4:3], 640x480 @ 60.00Hz, progressive
while switching both to "=0" and rebooting will give me:
state 0x120009 [HDMI CEA (1) RGB full 4:3], 640x480 @ 60.00Hz, progressive
Had found another page suggesting other troubleshooting, (thus why I disabled safe and hotplug), but still don't see supported modes under tvservice -m (DMT or CEA)
I suggest you definitely don’t want hdmi_safe, as this sets default low res,
and do want hdmi_force_hotplug, as this says regard it as hdmi output, even if no (sensible) result occurs when the boot-up initialisation is done.
You may want then to set a mode and res, but I couldn’t say what without details (there may be details in the TV spec).
Often the thing will be set sensibly if you power up the TV before the RPi.
HTH
Derek