Detecting HDMI status from CLI

[RobertF1]

Can anyone suggest a command line command that would return the status of the connected HDMI monitor? Whether it is on standby or not or something that might help to determine if the display is active or not.

 

I'm currently using Armbian Xenial on a H3 Orange Pi Zero Plus 2.

 

Thanks

[Tido]

HDMI-CEC... and Google

 

// sent from mobile phone //

 

 

[RobertF1]

Thanks Tido, but I'm writing to the forum because CEC has proven too slow to return the status information mailny because it has to setup a CEC connection first that takes a few seconds.

 

I am looking for a faster way to get the status of the monitor and was hoping for a non-cec method similar to the method availble to raspberry pi where one can query /sys/class/amhdmitx/amhdmitx0/hpd_state which equals 0 when the TV is off.

 

Is there something similar that can be queried on a H3 device?

[RobertF1]

Is there any command to query ANY info from the display? even if it's live resolution information, it might help to use that to determine status?

 

I notice that there's h3disp but I assume this is just for setting configuration not for querying?

[ning]

try xrandr ? or if you know how to use libdrm, you can write your own cmd.

[ning]

or if display driver is using DRM, maybe /sys/class/drm/ could help you. if display driver is framebuffer, no much info from /sys/class/graphics/