Yodeck supports any monitor with any resolution (4K, Full-HD, HD-Ready, or any other). The service was designed based on the primary resolution of 1920x1080 (dubbed “Full HD” or “1080p” in the TV industry).
The content is automatically adapted during playback for any resolution and any monitor up to 4K, even non-widescreen monitors. You can also specify alternative layouts to match different monitors and orientations.
If you want Yodeck to power on and power off your monitor, then there are two options:
Deactivating HDMI Port: This option is supported on the Yodeck Player (Raspberry Pi), but this usually works only on computer monitors (not TV sets)
HDMI-CEC Signaling: This option is supported on the Yodeck Player (Raspberry Pi), but this usually works only on TV sets (not computer monitors) (compatibility chart)
Yodeck uses both methods when trying to power on/off your monitor. The combination that likely causes trouble is when you are using a PC connected to a TV set. So, make sure that your installation does not use this combination, or the power on/off feature will not work (the TV will stay on, showing its own "No Signal" message).