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I have a page that talks about the yoga2, which uses HIDPI. http://srobb.net/yoga2.html

I boot into text mode and start X. Assuming the display is called eDP1 (sometimes eDP-1) you can open a terminal and do something like xrandr --ouput eDP1 --scale .7x.7 (I don't see the output line in your xrandr, didn't it say output eDP1 or similar?)

You can also in .Xdefaults (not sure where you would put it if you are booting into X), put

xft.dpi:192

The ArchLinux wiki has a page on hidpi https://wiki.archlinux.org/index.php/HiDPI

Also, at least on my yoga2, using the live workstation automatically scaled the screen correctly when it used Wayland.