My last laptop was fine, because it's native resolution matched my external monitor's. But now I have a high-dpi laptop and having trouble.

Laptop is 2560x1440. I manually set dpi to 125 by putting

#!/bin/sh xrandr --dpi 125x125

into /etc/X11/xinit/xinitrc.d/77-setdpi.sh (note to self - emacs leaves backup files in this dir which are stupidly NOT ignored by the X startup)

This setting seems pretty reasonable on this screen.

I plugin my external monitor which is 1920x1080. Go to Display Configuration. I'd prefer to have clone, but I guess that isn't a choice because of the difference in resolution. So I put them next to each other. Problem is, the dpi setting also affects the external monitor. All the fonts are too big.

More problems: here I am typing in knode. I placed it on the 2nd screen. When I choose 'post message', the window opens up with all the menus and window decorations off the top of the screen. Very inconvenient.

Any suggestions how to make this a better experience?