How to use HiDPI(4K) resolution in Linux for all applications

HiDPI (High Dots Per Inch) displays, also known by Apple’s “Retina Display” marketing name, are screens with a high resolution in a relatively small format. They are mostly found in high-end laptops and monitors.

update this


Xft.dpi: 240

reboot or re-login to system

*240 dpi is suitable for 3840x2160 resolution screen (15.4 inch displays )