Lol, it seems the Windows 10 updater picks whatever screen mode it can and then just assumes it's being stretched to 16:9 by a poorly configured monitor. Running on QEMU I get an anamorphic squished display.pic.twitter.com/EY6YouMOkL
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Sure, I'm sure if it finds a 16:9 mode it'll use it. The silly thing is that if it doesn't it seemingly decides it needs to squish the entire framebuffer (in software, presumably) on the arbitrary assumption that the user's monitor is 16:9 and configured in stretch mode.
Like, someone deliberately wrote some code to output an incorrect, wrong image on the assumption that the user's monitor is also incorrectly configured and they'll cancel out.
Before win7 they used 4:3, so I guess it's some improvement
With UEFI it doesn't even try to set the mode - it just uses whatever the firmware set (and assumes square pixels). It also doesn't let you change the mode from inside Windows until you install the appropriate display driver.
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