Receiver/TV does not display HDMI output from RP if powered on *after* RP

[tillheilmann]

If I turn on my RP 3b (HDMI connected to TV through receiver) when the TV and receiver are already on, everything works just fine. However, if I do it the other way around (first power on RP, then TV and receiver), the display stays blank. Is there a way around this?

[Ashpool]

That's expected behaviour (no hdmi signal from the display means no display information that could be queried to set the video mode).
AFAIK editing /boot/config.txt and setting the correct hdmi_group and desired hdmi_mode together with hdmi_force_hotplug = 1 should do the trick ;)

[tillheilmann]

@ashpool: Excellent, I will try that, thank you! I've already read that part of the RetroPie documentation but will have to go through it once again to really grok it.

[tillheilmann]

What @Ashpool suggested seems to have worked for me. In case anyone is interested, here's what I did...

First, with the RP up and running and the TV screen displaying correctly, I queried for the HDMI mode used:

$ tvservice -s
state 0xa [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive

From this and the RetroPie documentation on HDMI Mode I learned that in /boot/config.txt I had to set

hdmi_group=1

(for CEA) and

hdmi_mode=16

(for 1080p at 60Hz and 16:9). I also had to add

hdmi_force_hotplug=1

After rebooting the RP, the issue was resolved.

Thanks again, @Ashpool!