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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Notebooks only have a single resolution. It's up to the GPU to scale. When an OS driver is loaded, the driver controls that. Before, in VESA/UEFI modes, it's down to the video BIOS. Unfortunately, yeah, many of them will stretch scale (and there's no option to change that).
Yeah, it's essentially the GPU that decides - with almost all defaulting to stretch :(. I did at some point even patch the VGA BIOS (which was mostly a side-effect of adding other VESA resolutions), though.
In any case, I guess you could query the VESA resolutions. Most notebooks add their native one there. If there is a 16:9 resolution in the list, use 16:9. Standard VESA modes don't have 16:9.
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