Are there any solutions in Slackware-current that a give a nice desktop on a HiDPI laptop monitor screen? I'm wondering what others' experiences are on a HiDPI screen with -current.

I use ktown, so I just edit /etc/sddm.conf:

EDIT: And I have the following in ~/.Xresources:

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Like dugan said, Slackware -current with Plasma5 bolted on top will work perfectly with a HiDPI monitor.
I do not know about HiDPI capabilities on Slackware 14.2 and the Desktop Environments available there, unfortunately.

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Because so many programs draw on the screen, success with HiDPI is varied.

Font scaling works well. Set "Xft.dpi: 150" or higher in .Xresources

Firefox has its own way of scaling fonts. Under Preferences -> General-> Fonts & Colors -> Advanced, set a minimum font size of 22. I turn off the fuzzy bitmap scaling in prefs.js by setting user_pref("layout.css.devPixelsPerPx", "1");

The GTK2 theme is adjustable. Look at .gtkrc-2.0 and gtkrc

The biggest problem is that every application program needs to understand HiDPI. GTK2 has the ability to choose the most appropriate icon size, but most programs provide only 16x16. These icons look tiny on a HiDPI screen.

X Windows cursors also tend to be tiny, 16x16 again.

I have been using a 4K desktop monitor for years. It looks very nice except for the tiny icons.
Ed

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If you're on HiDPI, then just don't use GTK2 at all.

Well, I write a lot of my own programs and won't move them to GTK3. GTK2 works fine with HiDPI as long as programs understand it.
Ed

Right, I'm currently running awesomewm with some custom scaling stuff (Xdefaults, Firefox, GTK, Qt etc), but overall I'm not very happy with it. I get weird small mouse cursors and inconsistent scaling across applications. XFCE didn't seem to be that much better, so it sounds like KDE 5 is the way to go. I will try it out once (if?) it lands in -current.

You are going to have to live with inconsistent scaling across applications. For example, gvim and the mplayer -gui will have tiny icons in any desktop environment. These programs need to be updated.

I notice that more applications are providing 24x24 icons in addition to 16x16. 24x24 is a usable icon size on my 4K desktop monitor. It is probably still too small on a 4K laptop screen.
Ed