From: jpstewart@personalprojects.net   
      
   On 2025-12-24 11:15 p.m., Robert Riches wrote:   
   >   
   > Does anyone have favorite tutorials or other helps for dealing   
   > with a high-DPI transition?   
   >   
   > I'm Running Devuan (currently Daedalus, hopefully soon Excalibur)   
   > using plain X and fvwm2, no DE as such with 1920x1200 monitors.   
   > Just purchased a round of 4k monitors, so I'll be needing to   
   > adjust xterm fonts, web browser issues, other GUI application   
   > issues, etc.   
      
   It's been a couple years since made a similar switch.  But as far as I   
   recall, there's not much to do other than configuring X.  I had to   
   manually specify the monitors' physical size (in millimetres) in my   
   xorg.conf so that X could calculate the correct DPI.  Then everything   
   that's measured in points just kind of fell into place.  (E.g., there   
   was nothing to be done for LibreOffice, etc.)   
      
   You'll need to switch your window manager to a high-DPI theme (easy with   
   my choice, xfwm4) since that's all laid out in pixels and you'll have   
   tiny icons and title bars if you don't change.   
      
   There were very few apps that required any tweaking once X and the   
   window manager were correctly configured.  The venerable 'gv' is the   
   only one I can think of that required its own DPI setting (in   
   ~/.Xresources) rather than using X's own.   
      
   > For web browser issues, I anticipate a lot of fun with websites   
   > and web apps that use (n)px directives for some of their margins   
   > and spacing.  If the browser interprets those at face value,   
   > mixed with other directives in units of text elements and such,   
   > things could end up looking somewhat different from how the   
   > developers intended.   
   That's actually not an issue.  HTML/CSS "px" are NOT device pixels but   
   units of 1/96 inches.[1]  In other words, HTML/CSS "px" are standardized   
   at 96 DPI regardless of actual screen resolution.  So if something   
   specifies 24px it actually means 1/4 inch.  On my 4K displays that ends   
   up being more like 40 device pixels.  So websites will still work more   
   or less as expected.   
      
   [1] https://www.w3schools.com/css/css_units.asp   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)