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userguide: add a section about hidpi displays 

This is a continuation of #3438.
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Michael Stapelberg 2018-12-10 18:18:23 +01:00
parent f08119298e
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@ -2842,3 +2842,20 @@ and you are in multi-monitor mode (see <<multi_monitor>>).
Because i3 is not a compositing window manager, there is no ability to Because i3 is not a compositing window manager, there is no ability to
display a window on two screens at the same time. Instead, your presentation display a window on two screens at the same time. Instead, your presentation
software needs to do this job (that is, open a window on each screen). software needs to do this job (that is, open a window on each screen).
[[hidpi]]
=== High-resolution displays (aka HIDPI displays)
See https://wiki.archlinux.org/index.php/HiDPI for details on how to enable
scaling in various parts of the Linux desktop. i3 will read the desired DPI from
the `Xft.dpi` property. The property defaults to 96 DPI, so to achieve 200%
scaling, you’d set `Xft.dpi: 192` in `~/.Xresources`.
If you are a long-time i3 user who just got a new monitor, double-check that:
* You are using a scalable font (starting with “pango:”) in your i3 config.
* You are using a terminal emulator which supports scaling. You could
temporarily switch to gnome-terminal, which is known to support scaling out of
the box, until you figure out how to adjust the font size in your favorite
terminal emulator.