[arch-general] xrandr with XPS 13" (3840x2160) HiDPI and 30" (2560x1600) LowDPI

[Tyler]

> As far as I understand, QT_SCREEN_SCALE_FACTORS needs an entry for each 
> screen. The primary screen will get the first factor, then second screen 
> the second factor, so you can try this:
> 
> QT_AUTO_SCREEN_SCALE_FACTOR=0
> QT_SCREEN_SCALE_FACTORS="2;2"

SUCCESS! SUCCESS! SUCCESS!!

Now the font for Qt apps is correct on both screens using:

xrandr --output eDP1 --scale 1x1 --mode 3840x2160 --pos 5120x0 \
       --output DP1 --scale 2x2 --mode 2560x1600 --pos 0x0

https://i.imgur.com/KB5UNxy.jpg

I have made a revision to the wiki to make that clear.

https://wiki.archlinux.org/index.php?title=HiDPI&type=revision&diff=532206&oldid=529558

Thanks all who have helped!

-- 
Tyler