For more than a decade I have used only 4k displays (in most cases with 10 bit color components) on all my desktops and laptops, all of which run Linux.
I have never encountered any problem whatsoever. Only in Windows I have encountered sometimes scaling problems.
The only programs with which I had sometimes problems in Linux with high-DPI monitors have been commercial applications written in Java, some of which were very expensive. However those problems were not Linux-specific, but Java-specific, because those Java programs behaved equally bad on Windows.
For some reason, there seems to exist a high percentage of Java programmers who are incompetent at writing GUIs and the programs written by them neither follow the platform DPI settings nor allow the user to select a suitable display font, making their programs unusable without a magnifying glass when using high-DPI monitors. Moreover, I have encountered several expensive Java applications that crash and die immediately when used with monitors configured for 10-bit color instead of 8-bit color, both on Linux and on Windows.
So in more than a decade of using only high-DPI displays, I have never had problems with native Linux GUI applications, I have seldom encountered problems with native Windows applications and I have very frequently encountered problems with Java applications, regardless of the operating system on which they were run.
> For some reason, there seems to exist a high percentage of Java programmers who are incompetent at writing GUIs
There's multiple GUI Java toolkits and they all equally suck in their own way. Eclipse for example uses SWT which translates to the native application toolkit, which "should" support HiDPI, but as you're limited to native widgets it's not very common.
What's the issue you have with high DPI monitors? I've used 3200x1800 14" screens way back (on Fujitsu U904 when that came out: I found a review from 2014 online), 4k 24" Dell when it still required two DP cables for 60Hz, and more recently 4k 14" screens on X1 Carbon: while you need to configure scaling (I prefer 125% or 150% for UI elements, and fonts further increased by a factor of 1.4x), most programs work well with that (including non-native UI peograms like Firefox, LibreOffice or even Emacs).
For a long while there was an issue with multiple monitors which you want to configure with different settings: you couldn't.
I believe that is also fixed today with Wayland but I mostly stick to a single monitor anyway.
For more than a decade I have used only 4k displays (in most cases with 10 bit color components) on all my desktops and laptops, all of which run Linux.
I have never encountered any problem whatsoever. Only in Windows I have encountered sometimes scaling problems.
The only programs with which I had sometimes problems in Linux with high-DPI monitors have been commercial applications written in Java, some of which were very expensive. However those problems were not Linux-specific, but Java-specific, because those Java programs behaved equally bad on Windows.
For some reason, there seems to exist a high percentage of Java programmers who are incompetent at writing GUIs and the programs written by them neither follow the platform DPI settings nor allow the user to select a suitable display font, making their programs unusable without a magnifying glass when using high-DPI monitors. Moreover, I have encountered several expensive Java applications that crash and die immediately when used with monitors configured for 10-bit color instead of 8-bit color, both on Linux and on Windows.
So in more than a decade of using only high-DPI displays, I have never had problems with native Linux GUI applications, I have seldom encountered problems with native Windows applications and I have very frequently encountered problems with Java applications, regardless of the operating system on which they were run.
> For some reason, there seems to exist a high percentage of Java programmers who are incompetent at writing GUIs
There's multiple GUI Java toolkits and they all equally suck in their own way. Eclipse for example uses SWT which translates to the native application toolkit, which "should" support HiDPI, but as you're limited to native widgets it's not very common.
What's the issue you have with high DPI monitors? I've used 3200x1800 14" screens way back (on Fujitsu U904 when that came out: I found a review from 2014 online), 4k 24" Dell when it still required two DP cables for 60Hz, and more recently 4k 14" screens on X1 Carbon: while you need to configure scaling (I prefer 125% or 150% for UI elements, and fonts further increased by a factor of 1.4x), most programs work well with that (including non-native UI peograms like Firefox, LibreOffice or even Emacs).
For a long while there was an issue with multiple monitors which you want to configure with different settings: you couldn't.
I believe that is also fixed today with Wayland but I mostly stick to a single monitor anyway.