Linux Mint has worked well for me, but I want to try HDR on my monitor and get better results at 125% scaling. Some apps have very small interfaces, and not all of them are available as AppImages. What should I try?
What Linux distro should I try for HDR and fractional scaling?
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Look for a distribution with a recent KDE Plasma desktop and use a Wayland session. Plasma is the part that handles the desktop scaling and HDR settings, so the desktop environment matters at least as much as the distro name here.
I'd try a live session first and check both the HDR setting and the specific apps that look tiny at 125%. Scaling behavior can vary between applications, so changing desktops won't necessarily fix every one of them.
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You could look at installing Plasma on Mint instead of switching right away, but check which version is available from your current software sources first. An older release might not give you the HDR features you want. A separate installation or live session may be an easier way to test a newer Plasma without changing your existing desktop.
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Solus has a KDE edition you could put on the shortlist. The desktop edition matters here, though. HDR support in KDE does not mean the Budgie edition has the same support. Check the current release and test it with your monitor before committing.
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LUNCH.breaker:
Worth checking the Plasma version too. A distro that offers an older Plasma release may not have the HDR support you're looking for.