Hi Benjamin,
The CEC specification allows sending certain CEC messages even if there is no
HPD
signal. This is for displays that turn off the HPD when they go into standby or
switch to another input, but still keep the CEC bus alive.
Support for this was added to 4.12. But does your driver handle this? Sometimes
when the HPD goes away the HDMI driver powers off the CEC part as well.
I test this with a pulse-eight USB CEC adapter, since it is easy to setup this
situation (just don't connect anything to the TV).
Without that adapter it might be harder to test this.
Regards,
Hans
