Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first
HDMI on with boot
-
I need help figuring out which command in the config.txt file will turn on hdmi when a display is not yet on or connected
TIA
-
hdmi_force_hotplug=1 hdmi_drive=2
Those should force it to use hdmi even if a monitor isn't connected at boot but you might notice the resolution isn't set right. You can look at http://elinux.org/RPiconfig#Video_mode_options for more fun things you can tinker with.
Contributions to the project are always appreciated, so if you would like to support us with a donation you can do so here.
Hosting provided by Mythic-Beasts. See the Hosting Information page for more information.