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

Sun Jul 25 18:16:51 UTC 2021

On Sun, Jul 25, 2021 at 12:38 PM Stephen Worthington <
stephen_agent at jsw.gen.nz> wrote:

> On Sun, 25 Jul 2021 11:04:36 -0400, you wrote:
>
> >On Sun, Jul 25, 2021 at 10:24 AM Stephen Worthington <
> >stephen_agent at jsw.gen.nz> wrote:
> >
> >> On Sun, 25 Jul 2021 09:17:35 -0400, you wrote:
> >>
> >> >
> >> >On 7/25/21 8:18 AM, Stephen Worthington wrote:
> >> >> 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.
> >> >
> >> >The switch I picked was about $40 and worked great until I started
> >> >testing at 4K at 60. I tried using the second HDMI on the TV but had
> issues
> >> >with that, so I didn't spend a lot of time with it. Since I split the
> >> >output of the switch with a HDMI 2.0 digital audio extractor. I didn't
> >> >want to go that route.
> >> >
> >> >the switch I use is
> >> >
> >> >
> >>
> https://www.amazon.com/gp/product/B07MCS9PJD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
> >> >
> >> >Jim A
> >>
> >> There is no sign on that page of EDID support, so it likely does not
> >> have it.  HDMI switches with EDID support normally tell you as it is
> >> an important feature, and justifies higher cost.
> >>
> >> I did an experiment. I plugged in my NUC PC directly to my HDMI2 TV
> port.
> >I could not see anything until I changed the HDMI UHD color setting to
> turn
> >OFF HDMI 2.0. At that point I could see the PC desktop, but it was only
> >4K at 30.  To get 4K at 60 I have to turn on HDMI 2.0 support.
> >
> >So now I'm back on my HDMI 2.0 Switch and HDMI 2.0 support is turned on
> for
> >that HDMI1 port. The PC is set to 4K at 60 and the TV info shows 4K at 60. I
> also
> >have a Nividia Shield TV connected to the switch and it works at full
> 4K at 60.
> >
> >While trying to write this email the screen has blanked out for a second
> >twice.
> >
> >Rebooting seems to be my only choice.  However, I'm very curious why the
> PC
> >directly connected to the TV HDMI2 port can run 4K at 60 with the TV in HDMI
> >2.0 mode??
> >
> >Since the EDID switches are expensive and so are newer UHD TV's, I'm stuff
> >for now.
> >
> >Jim A
>
> If it is an EDID problem, you can always just copy the EDID data and
> tell set up the xorg.conf to point to it.  In Ubuntu, install the
> read-edid package and run:
>
> get-edid >edid.bin
>
> Put the edid.bin file into /etc/X11, then make the Device section of
> /etx/X11/xorg.conf look something like this:
>
> Section "Device"
>   Identifier     "nvidia"
>   Driver         "nvidia"
>   Option         "ConnectedMonitor" "DFP-0"
>   Option         "CustomEDID" "DFP-0:/etc/X11/edid.bin"
>   Option         "IgnoreEDID" "false"
>   Option         "UseEDID" "true"
> EndSection
>
> Change the DFP-0 to match what you see in /var/log/Xorg.0.log, and use
> the matching Identifier and Driver names.
>

So currently I don't have an xorg.conf.  So how is the correct way to
create it so I can change the Device section?

Also my system only has the Intel Xe Graphics.

FYI my Xorg.log is at: "/home/jim/.local/share/xorg/Xorg.1.log"

Checking there I think the DFP-0 should be HDMI-1

[    30.185] (II) modeset(0): EDID for output DP-1
[    30.227] (II) modeset(0): EDID for output HDMI-2
[    30.227] (II) modeset(0): EDID for output DP-2
[    30.227] (II) modeset(0): EDID for output DP-3
[    30.227] (II) modeset(0): Output HDMI-1 connected
[    30.227] (II) modeset(0): Output DP-1 disconnected
[    30.227] (II) modeset(0): Output HDMI-2 disconnected
[    30.227] (II) modeset(0): Output DP-2 disconnected
[    30.227] (II) modeset(0): Output DP-3 disconnected

Jim A
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