This is a table of desktop resolutions, while it is possible that someone might have connected a 2" 640x480 screen to their desktop, it is very safe to assume that only resolutions above 2560x1440 are HiDPI and anything else is just noise.

"Desktop" includes laptop at statcounter. 1080p is supposed to be 23".

And again if it's simply the resolution the browser reports it is post scale so a 2560x1440 laptop at 150% would show as 1920x1080 anyways. It's web stats, they only care about the size of the viewport.

Yes, i'm also talking about laptops here, not just desktops.

If you can go by with 150% this isn't HiDPI (and on most laptops 150% for 1080p is too big anyway, at least on Windows, you want something around 125%). HiDPI is something that you need at least 200%, like Apple's 2560x1600 at 13" where anything less is unusable. Using 100% scaling on a laptop at 1080p is perfectly fine (this is my laptop configuration and how i use it).

Remember that "HiDPI" was the generic term that was used in place of Apple's trademarked "Retina" and what is i am talking about.

The entire discussion is about why HiDPI isn't supported and the answer is simply that few people need it (as shown by the stats i linked above and below) and fewer are in a position to implement it.

Anything above 100% is considered high DPI on Windows, including 125%. I.e. if the display DPI is not 100% and the app isn't DPI aware you will end up with a blurry mess since the OS will stretch the app for you via bitmap scaling by a factor of DPI / 100%. Apple is the only one that does integer factor only DPI for their hardware (100%, 200%, 300%...) and their entire current lineup is >100% now.