[vladvasiliu]

> UI scaling took a long time to get good, but it's more flexible than macOS now for pixel-perfect output on displays that aren't multiples of 1440p. (e.g. 4K)

We can't be using the same windows. At work we have 27" 5k displays which I use at 200%, so a perfect multiple of the usual 100% I use everywhere else. The screen is blurry 99% of the time. The only reliable way to get it sharp is to boot the PC with the screen attached. Of course, if I go to the toilet and the screen turns off, when I come back it's just like hot-plugging it: a blurry mess.

Apparently, updating the graphics driver also works, so I suppose it's enough to restart just that instead of the whole OS. Don't know how to do that, though. The resolution is reported as the correct one, changing scaling options doesn't help. 100% looks sharp enough, but it's unusable for me.

And I don't use any old app, it's mostly new outlook and edge. But even the start menu is blurry! There's also the fact that afterwards, tray icons' menus tend to appear in random places, but I understand that apps draw those, so I guess this isn't completely windows' fault.

My work machine dual-boots Linux, which is what I actually daily drive, and these screens have pushed me to switch to Wayland. Now there are some rough edges there, but the high-dpi is handled perfectly (same setup as windows: everything 100% except for that one screen at 200%). This is using Sway and mainly Firefox, Chromium and Alacaritty. Native GTK apps seem to work fine, too, but I don't use many of those.

edit: not sure about your mac point. I sometimes use a mac and it works at 200% on two separate 4k screens.

[Marsymars]

> edit: not sure about your mac point. I sometimes use a mac and it works at 200% on two separate 4k screens.

200% scaling works if you only want "looks like 1920x1080", but if you have a 27" 4K display, I'd typically want "looks like 2560x1440" or 150% scaling - if you do that on macOS, the desktop is rendered at 5120x2880 and then downscaled to 3840x2160. So you're getting both higher resource draw from rendering the desktop at a higher resolution and losing pixel-perfect rendering.

It won't be a problem for most people, but it's enough of a problem for me that I won't use macOS with scaled displays.

[whyoh]

>The screen is blurry 99% of the time. The only reliable way to get it sharp is to boot the PC with the screen attached.

That sounds like a (graphics driver) bug. It's not something I ever experienced on Windows 10, even when occasionally connecting an additional display set to 150% scaling. I believe you, though, bugs do happen.

>not sure about your mac point. I sometimes use a mac and it works at 200% on two separate 4k screens.

I think his point is that on macOS you pretty much have to use 200%, whereas on Windows it can be any value (though multiples of 25% are recommended).

[vladvasiliu]

> that sounds like a (graphics driver) bug.

It wouldn't surprise me, although this is a bog-standard-fare enterprise laptop, a 5 year-old full Intel affair. No dedicated GPU or anything fancy.

But, for a long time, I had weird issues with display output on Windows. It would refuse to output 4k@60Hz without doing a stupid plug-unplug-replug-just-at-the-right-time dance, even though it worked on Linux. It took a good 3 years for that to work reliably.

And, in the beginning, those 5k screens only worked at 4k for some reason. Again, no issue on Linux.

But when any of the above situations happened, the state was actually correctly reported, as in 4k@30 Hz, or the 5k screen running at 4k. That's not the case now, everything says what it should, but the image is not sharp.

That's the only situation where I use Windows with scaling, so don't have any easy way of figuring which component is broken. All I can say is that the hardware itself seems to work fine.