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

[Tyler]

> I was able to get that working using my numbers for the Dell 30" 3008WFP
> 
> xrandr --dpi 220 --fb 8960x5360 \
>     --output eDP1 --mode 3840x2160 --pos 5120x0 \
>     --output DP1 --scale 2x2 --pos 0x0 --panning 5120x3200+3840+0

I made a mistake there that should have been:

xrandr --dpi 276 --fb 5120x3200 \
    --output DP1 --scale 2x2 --mode 2560x1600 --panning 5120x3200 \
    --output eDP1 --off

-- 
Tyler