Re: Better way to refresh the Display?

[Javier Perez <pepebuho@xxxxxxxxx>]

On Sun, Dec 11, 2022 at 11:32 AM Patrick O'Callaghan <pocallaghan@xxxxxxxxx> wrote:

On Sun, 2022-12-11 at 09:21 -0500, Javier Perez wrote:
> Hi
> I have a problem. Oftentimes when I press the button on my KVM to
> return to
> my desktop and Fedora 36, the screen is black and unresponsive.
> I have to log in through SSH and restart lightdm (systemctl restart
> lightdm)
> Problem is that it resets my sessions and some programs like cura do
> not
> like that and even trash their configuration files.
> Looking through the system log I do not see any problem at the time I
> made
> the switch back to the desktop.
>
> 1. How can I troubleshoot why sometimes I can come back and
> othertimes I
> cannot?
> 2. Is there any less destructive way to recover the display than
> restarting
> lightdm?
>
> I do not have that problem with my other computer, but then,  I use
> it as a
> fileserver and it does not have that many programs installed.

I don't know if this is relevant, but how is the KVM connected to the
display? I had one that would remove the HDMI signal on inactive
display inputs, even when they were physically connected, which made
the system think the display was turned off. I replaced it with one
that keeps a live signal on all connected ports and haven't had a
problem since.

I think it most be removing the HDMI signal. Each I switch out, I start getting the following messages on the journal

Dec 10 02:32:04 pepewin.localdomain kernel: nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device ViewSonic VA2446 Series (VGA-0)
Dec 10 02:32:14 pepewin.localdomain kernel: nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device VGA-0
Dec 10 02:32:25 pepewin.localdomain kernel: nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device VGA-0
Dec 10 02:32:35 pepewin.localdomain kernel: nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device VGA-0
Dec 10 02:32:45 pepewin.localdomain kernel: nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device VGA-0
Dec 10 02:32:55 pepewin.localdomain kernel: nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device VGA-0

 

poc
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------------------------------
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 |O O|  pepebuho@xxxxxxxxx
 ~~~~     Javier Perez
 ~~~~          While the night runs
 ~~~~          toward the day...
  m m       Pepebuho watches
                from his high perch.

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