Er is dus een veel mooiere oplossing, die in één keer alles in de juiste verhouding zet.
Gevonden bij:
http://blog.mlindgren.ca/entry/2015/02/21/configuring-dpi-in-lubuntu-slash-lxde/If you've tried to use Lubuntu (or LXDE on another distribution) with a high-DPI display, you've probably noticed that fonts and other UI elements are so tiny as to be illegible without a magnifying glass. You've probably also noticed that there is no GUI with which to adjust the UI scaling factor. Happily, it is possible to change the DPI settings in LXDE, but this being Linux, it requires editing obscure configuration files. Here's what you'll need to do:
In your home directory, create a new text file named .Xresources
In this file, enter your desired DPI in the following format: Xft.dpi: 150
Restart the X server. You can do this by pressing Ctrl + Alt + F1 to enter single-user mode, then running sudo service lightdm stop, and then sudo service lightdm start. (Note that it may be a different service if you are not running Lubuntu. Alternatively, you can just reboot your machine.)
This will scale UI elements in most, but not all, applications.
dpi van 150 was mij wat te heftig. Staat bij mij op 125. Ziet er prima uit.
Met dank aan EvC, die zette mij aan het denken m.b.t. de resolutie aanpassen.