I've installed ubuntu 16.04 on my asus ux305fa but the screen resolution is set at 96x96 DPI, which make everything look very small. I know that the optimal resolution would be 138x138 but when I try to change it from terminal nothing happens. I've tried with xrandr:
`xrandr -- dpi 138/eDP1`
and
`xrandr -s 1920x1080`
It seems like the xrandr command doesn't work at all