Re: OT: recommendations for a 2880x1800 external monitor?

On Thu Jul02'26 07:34:45PM, Felix Miata wrote:
> From: Felix Miata <[email protected]>
> Date: Thu, 2 Jul 2026 19:34:45 -0400
> To: [email protected]
> Reply-To: Community support for Fedora users <[email protected]>
> Subject: Re: OT: recommendations for a 2880x1800 external monitor?
> 
> Ranjan Maitra composed on 2026-07-02 11:35 (UTC-0500):
>  
> >> Simpler choices I suggest to try for mirroring the two:
>  
> >> xrandr --output eDP-1 --mode 2880x1800 --pos 0x0 --output HDMI-1 --mode 3840x2160
> >> --scale-from 2880x1800
>  
> >> xrandr --output eDP-1 --mode 2880x1800 --pos 0x0 --output HDMI-1 --mode 3840x2160
> >> --scale .75x.75
>  
> > I now can not recall about the first one, but the second and third do the same thing. Which likely makes sense. However, both screens are completely filled (how is this possible?) and what is really bad about the HDMI-1 screen is that it does not display new windows or the mouse cursor or even when you write on an existing terminal then the script gets messed up (I do not quite know how to explain this) to be unreadable. The eDP-1 screen looks fine to me.
>  
> > So, I am missing something. 
>  
> This works here, without adjusting for the different aspect ratios:
> xrandr --output DVI-D-1 --mode 1920x1200 --primary --pos 0x0 --output HDMI-1 --mode 2560x1440 --scale-from 1920x1200 --same-as HDMI-1 --pos 0x0
> 
> So, for you, without adjusting for the different aspect ratios:
> xrandr --output eDP-1 --mode 2880x1800 --primary --pos 0x0 --output HDMI-1 --mode 3840x2160 --scale-from 2880x1800 --same-as HDMI-1 --pos 0x0
> 
> Or, substitute --scale .75x.75 for --scale-from 2880x1800. At least so far the
> entirety of the small screen is included on the larger.
> 
> I'm getting stumped as yet trying to correct for the different aspect ratios, but
> still trying. The stumper is the bottom of the big screen is missing the bottom of
> the small screen (no panel) when I get the aspect ratio corrected. When I get the
> whole desktop on both, then the larger screen's windows are stretched horizontally.
> Perhaps Patrick is right that black bars are needed....

Right, black bars have to show up because how else can you fix a rectangle of one height/weight proportion into another of different one, without stretching or cutting out?

I will see if Patrick comes up with some suggestions on a native resolution monitor, otherwise will try based on that webpage.

Many thanks again, and best wishes,
Ranjan

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