[mythtv-users] Can't start mythfrontend with TV off since moving to Intel graphics

[Mark Kendall]

Paul

My gut feeling is that this is probably fixable (and indeed needs
fixing) in the MythTV code.

The Qt code will use a default/dummy screen if nothing is connected at
startup. It then detects when the new screen is connected (or powered
on in this case).

There are various signals that we listen for in the MythTV code to
identify when screens have been added/removed etc. See:-

https://github.com/MythTV/mythtv/blob/master/mythtv/libs/libmythui/mythdisplay.h#L52

The mythfrontend logs should show activity when any of the
ScreenAdded, ScreenRemoved or PrimaryScreenChanged slots are
triggered. The ScreenChanged slot may show activity - but only if the
actual QScreen object has changed (this was written to handle moving
the mythfrontend window from one screen to another - either
programmatically or manually). If nothing else there should be a
signal that the available geometry has changed when the monitor is
connected.

I suggest gathering some logs with additional Qt logging to see what
might be happening.

QT_LOGGING_RULES=qt.qpa.screen=true mythfrontend

I would try that with and without the custom EDID and leave it until
the display has definitely turned on (i.e. to see if any Qt screen
code is triggered)

Regards
Mark