On Friday, September 1, 2017 7:28:48 PM CEST Mart Raudsepp wrote:
> Ühel kenal päeval, R, 01.09.2017 kell 10:16, kirjutas Grant:
> > > My laptop's 13" screen has a native resolution of 3200x1800 which
> > > makes everything crazy small on-screen.  Is there a good method for
> > > telling Xorg or xfce4 to compensate, or should I one-at-a-time my
> > > applications?  I can adjust the resolution down but it makes the
> > > colors look weird.
> > 
> > After some more research, it turns out this is a pretty well-known
> > problem on the Linux desktop (it's called HiDPI) without a good
> > solution... except for this:
> > 
> > https://forums.linuxmint.com/viewtopic.php?t=159064
> > https://bugs.freedesktop.org/show_bug.cgi?id=94816
> > 
> > The solution is to patch xrandr with the capability to do nearest
> > neighbor filtering and run xrandr like this:
> > 
> > xrandr --output eDP1 --mode "3200x1800" --scale "0.5x0.5"
> > 
> > It works great.
> 
> I don't see how it can be called great. This is pretty much losing most
> of the benefits you have with a HiDPI screen, by just making it be
> almost the same as a 1600x900 screen, except the scaling involves some
> nearest neighbor filtering, which sometimes might be good, sometimes
> bad, and never as good as rendering things in HiDPI.
> 
> For HiDPI you want the toolkit to support it properly and configure it
> as such. GTK+3 is such a toolkit, but outside of GNOME (where it works
> out of the box), I don't know what exactly it takes to set things up.
> Plus you'll need a solution for your gtk2/whatever other things,
> preferably one that doesn't make things worse for gtk3 things, like
> that xrandr hack does.
> 
> Probably something like
> gsettings set org.gnome.desktop.interface scaling-factor 2
> combined with something for the other stuff that doesn't mess with the
> former.
> Outside GNOME, maybe exporting GDK_SCALE=2 works, if the dconf setting
> isn't honored outside it.

In KDE/Plasma there is a scaling setting in the display section. 
The scales go from 1 to 3 (in steps of 0.1)

Seems to work, I don't need it on my displays as I tend to simply increase the 
font-sizes where necessary.

--
Joost

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