Monitor res

[Liam Proven]

On Wed, 19 Nov 2025 at 05:42, Grizzly via ubuntu-users
<ubuntu-users at lists.ubuntu.com> wrote:

> Oldish Dell Insperion (not sure model #)

We 100% need that info.

> > (also the monitor is
> >> shared via KVM with another PC (Radion 9200)
>
> >A KVM is a *very* bad idea for an hi-res screen. You need special
> >high-quality KVM switches for anything over about 800*600.
>
> It's old but has worked well for me ever since I went from a Dell 21" CRT with
> duel inputs to my last 24" Samsung with only one input (hence the Balkin KVM)

CRTs use a partly analogue connection. A KVM is no problem.

LCDs and other flatscreens use an all-digital connection. The PC needs
to listen to data coming from the screen to know what resolutions the
screen can handle. Some of these data can't go over analog VGA cables,
and worse still, some KVM switches block the data -- the KVM does not
transmit it.

This stuff cannot be relied upon to work through a KVM.

Ditch the KVM and ditch the analogue SVGA cables. Use HDMI and I
predict all the problems will go away.

I think that all the other troubleshooting I have seen on the list is
totally irrelevant and it's missing the core problem

-- 
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