On 08/09/2017 11:03 AM, Frederic Muller wrote:
> Hi!
> I run GNOME on a 2560x1440 resolution display where I disabled the "double 
> scaling"
> (not sure how it's called). So one pixel is one dot. Unfortunately when 
> running Qt
> applications such as VLC for example they autoscale to 1 dot for 4 pixels 
> making
> those huge and taking most of my display area. When on dual screen they even
> recognize which screen is HiDPI and therefore automatically scale back on the 
> non
> HiDPI screen kind of forcing me to run all my Qt apps on that external screen.
> Unfortunately I do not always have an external screen to save me...
> So is there a way (like with GNOME) to disable this feature and have Qt apps
> display "normally"?

FYI, this is a guess on my part since I've not had to deal with this issue.

I think I would look to http://doc.qt.io/qt-5/highdpi.html and see how these
environment variables may be help...

QT_AUTO_SCREEN_SCALE_FACTOR [boolean] enables automatic scaling, based on the 
density of the monitor. This will not change the size of point sized fonts, 
point is a physical unit of measure. Multiple screens may get different scale 
QT_SCALE_FACTOR [numeric] defines a global scale factor for the whole 
including point sized fonts.
QT_SCREEN_SCALE_FACTORS [list] specifies scale factors for each screen. This 
will not
change the size of point sized fonts. This environment variable is mainly 
useful for
debugging, or to work around monitors with wrong EDID information(Extended 
Identification Data).

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