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The fbmm flag sets the reported physical size of the X screen as a whole.

With that, everything looked good on both monitors. To fix that, I had to use xrandr to upscale the 1080p display by 1.5x (2880×1620) to compensate for the desktop environment’s 1.5x scaling. That made everything on the 4K monitor look properly sized and large on the 1080p monitor. So for a while, I had to resort using just konsole on the secondary 1080p monitor with the font size reduced to make it look okay and the interface elements still looking large and ugly.Įventually, I found out the solution that I needed – scale the desktop environment 1.5x which reduced the effective resolution of the 4K (3840×2160) monitor to 1440p (2560×1440) and that of the 1080p (1920×1080) monitor by 1.5x to 720p (1280×720). This was very important for someone like me who isn’t familiar with the terminology. However, all of those were for setups different from mine and used a lot of parameters and flags without a general explanation of what they do and how to adapt them for other scenarios.

Scaling in the desktop environment translated to zooming in the desktop by 1.5x (“downscaling”) to make everything look larger and (up)scaling the display using xrandr meant zooming out the Xorg display for the monitor 1.5x to make everything look smaller.Ī lot of different xrandr commands were given as examples. What confused me a long time is that “scaling” meant different things when it came to xrandr and the desktop environment. I read multiple recommendations on the internet to scale (mentioned correctly in a few places as “upscaling”) the 1080p display using xrandr to compensate for the scaling done by the desktop environment so that everything looks okay on both displays. I was aware that Wayland supports mixed DPI environments very well but I was stuck on Xorg due to having an Nvidia GPU and Plasma’s support for EGLStreams still being a work in progress. 1.5x scaling in the Display settings on Plasma made everything look okay on the primary 4K monitor but look large and ugly on the 1080p monitor.