so you want a dual-dual-monitor setup with a KVM.

Have you considered getting a single large 4k monitor/tv instead of 2
smaller ones(assuming the smaller ones are 1080p)?  That would
simplify a lot of what you would need to buy.

I am running a 4k TV across 2 machines, physically it is 43" and I
have the usable resolution/space of 4 22" 1080P monitors.   The color
on my TV is decent and it is a cheap 4k tv ($220 + tax), so may not be
much more expensive that the hardware needed to implement the above.

I use the TV input/remote switch  + a USB keyboard-mouse switch to
switch control from one to the other.   On one of the machines I have
a second small monitor(not on a switch) off to the side showing stuff
I always want to be displayed(outside cameras).

On Fri, Oct 6, 2023 at 11:06 AM Patrick Dupre <pdu...@gmx.com> wrote:
>
> I am sorry for the confusion.
> I am attaching a pdf to clarify my approach.
>
> The question is about what to set in PC1.
> The VGA port cannot be used for this setup.
> Option 1:
> try to use the DVI of the MB and
> add a graphics card with one DP port
> Option 2:
> add a dual port DP/DP video card, with a converter DP to DVI
> Option 3:
> try to use the DVI of the MB and
> add a USB-C card with a converter USB-C to DP
> Option 4:
> add a dual USB-C card with a converter USB-C to DP and USB-C to DVI.
> Option 5
> add a dual port DP/DVI video card
>
>
>
> > Sent: Friday, October 06, 2023 at 4:48 PM
> > From: "Roger Heflin" <rogerhef...@gmail.com>
> > To: "Community support for Fedora users" <users@lists.fedoraproject.org>
> > Subject: Re: Monitors
> >
> > ok.  that makes a bit more sense.  And by KVM he means just
> > keyboard-mouse since he has 2 monitors and does not need the video
> > and/or the video is separated by monitor.
> >
> > I am not sure what he is trying to do given this setup.   Depending on
> > what he is trying to do, there may be easier ways to do what he wants.
> >
> > Then the question becomes what will X/wayland allow you to separate.
> > With 2 separate video cards of some sort that should be safer, I am
> > not sure 2 X/wayland instances would play nice with the same video
> > card but underlying 2 monitors.
> >
> >
> > On Fri, Oct 6, 2023 at 8:31 AM Patrick O'Callaghan
> > <pocallag...@gmail.com> wrote:
> > >
> > > On Fri, 2023-10-06 at 05:55 -0500, Roger Heflin wrote:
> > > > I don't believe KVM allows separation by video port.  I think you can
> > > > only give a KVM the entire card.  And even if KVM allowed you to give
> > > > it a single port I think X/Wayland assumes total control of the card
> > > > and cards ram (I could be wrong, but that would require knowing about
> > > > the 2nd instance and playing nice with each other, and that seems
> > > > like
> > > > a lot of work so, and even if it was done it probably does not work
> > > > right).    I don't think #1 will work, #4 would work so long as you
> > > > have 2 usb-c converters.
> > > >
> > > > What are you doing inside the KVM that you need to give it a real
> > > > video card?  Or does the virtual one simply work that bad?
> > > >
> > >
> > > I suspect some confusion about the meaning of KVM. I think the OP means
> > > a physical Keyboard-Video-Mouse switch, not the kernel virtual machine
> > > system.
> > >
> > > poc
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