[mythtv-users] Strange resolution problem

[Michael T. Dean]

On 07/06/2015 06:32 AM, Damian wrote:
> The first thing I did was test a particularly bad scene from a program 
> I watched a few nights ago. That would now play without any problems. 
> So, I decided to watch a full film last night. It was pretty good 
> throughout, but at about 3 points throughout the film, it had two or 
> three of these 'black and searching' screens, then after a couple of 
> seconds it pops back up having found the resolution again (switching 
> between 1920x1080 and 1919x1080). 

The fact that the annoying mode is 1 pixel less than your normal/desired 
mode leads me to assume that this may be related to the Window Manager 
you're using "scaling away" some 1-pixel-wide auto-hidden bar on the 
side of your screen every once in a while. I'd guess it's one of those 
fancy, compositing Window Managers. That said, if I'm correct, it won't 
help you fix the issue with your projector disliking mode changes 
(and/or prevent mode changes), but it may help find ways to avoid the 
changes (even it means just switching to a different, 
less-fancy-but-much-better-for-MythTV-type-usage Window Manager).

Note, too, that MythTV will only change the mode if you enable:

Separate video modes for GUI and TV playback
Switch X Window video modes for TV. Requires "xrandr" support.

and set the appropriate related settings.  So, if your mode is changing 
and you have that disabled, it's not MythTV that's doing the changing.

Mike