[mythtv-users] Video and sound turning off for 2 seconds then returning

Stephen Worthington stephen_agent at jsw.gen.nz
Sun Jul 25 12:18:12 UTC 2021

On Sun, 25 Jul 2021 07:27:16 -0400, you wrote:

>This problem is most likely caused by changing HDMI inputs away from my 
>PC and then back again. It's more subtle than it was a few years ago 
>when I was chasing this on 1080P.
>I've recently tried setting my PC to UHD 4K with a scale factor of 200% 
>on any *buntu version with 5.11 kernel so I have gfx software new enough 
>to support my 11th gen Intel based NUC.
>This seems to help 1080 content like mythtv since the TV in UHD improved 
>HD content.
>If I set my HDMI 2.0 switch to the NUC and boot it, my TV is rock solid 
>regardless of what video I play, mythtv, streaming, games, etc.
>If I leave the NUC on and switch to another HDMI source and later back 
>to the NUC I get the occasional screen blanking and loss of audio for 
>about 1-2 seconds. This repeats randomly.
>I can fix this by:
>1. rebooting or
>2. setting the screen to 1080p 100% scaling.
>This sound like that old problem where you had to capture the EDID in a 
>file and play with xorg.conf so the settings got reset with an HDMI 
>event like switching.
>I can't find that old discussion.  I have not had to do any such tricks 
>is a very long time.  This just started when I changed to 4K settings 
>instead of HD.  It's always been a 4K TV. I thought it might be hardware 
>but all the cables and switches are 4K at 60 HDMI 2.0 rated.
>At this point I just reboot each time I want to connect the PC to to the TV.
>Any ideas??

You could get a better HDMI switch - I think there are ones that will
remember the EDID data and emulate the presence of the TV on any ports
where the real TV is not connected.  Full KVM switches seem to usually
have that feature.  But good HDMI KVM switches are not cheap.

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