[Qgis-developer] QGIS/Linux on high-resolution displays

[Alessandro Pasotti]

2016-06-07 23:17 GMT+02:00 Barry Rowlingson <b.rowlingson at lancaster.ac.uk>:

> Ive just bought a Dell XPS13 which came with Ubuntu 14.04
> pre-installed. The screen is 3200 pixels across. Getting applications
> to scale properly is a nightmare.
>
> QGIS (and I guess all Qt apps) seems to be the worst. The icons are
> microscopic, and the text and other interface elements overlap. It is
> unusable. Same for Gimp and Inkscape, but I mostly use QGIS.
>


QGIS works pretty well (with some minor glitches) in KDE on 4K and retina
screens, see the tips and the links in this article
http://www.itopen.it/qgis-and-qt-getting-ready-for-hidpi-screens/



> I've tried a couple of things: "xrandr --scale" ends up with very slow
> performance and poor graphics quality; the scaling slider in the
> display settings seems only to work with gnome apps.
>
> Any other suggestions? Can I get QGIS to use larger icons? Do I really
> have to wait until QGIS adopts Qt 5.6 which, says the internet, has
> proper support for high resolution displays? Or do I have to run my
> screen at lower resolution?
>
>

No, try setting:
- the dpi resolution in the display configuration of your OS (system
settings), that is usually a wrapper for xrandr
- for QT5, the env vars  QT_DEVICE_PIXEL_RATIO=2 and/or
QT_SCREEN_SCALE_FACTORS=2
- icon size in QGIS can be (at least in part, for the toolbar) configured
in the QGIS options dialog

See also: http://doc.qt.io/qt-5/highdpi.html




> Barry
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-- 
Alessandro Pasotti
w3:   www.itopen.it
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