[ModEdit; related ticket: #17345: Display showing at 1/4 size, mouse input area normal (Windows host / Linux guest)]
Been working on this a couple days, and unable to find a work solution.
Using windows 10 host on a laptop with 3840 x 2160 resolution screen, and scaling set to 200% (fonts and such are two small otherwise).
After installing Guest Additions on any linux guest (Fedora, Mint, or Ubuntu), the guest display only uses 1/4 of the screen, located in the upper left hand quarter. The mouse however acts as if the entire screen is being used.
I've verified the correct version of guest additions is installed on the guest via the following commands (on Mint):
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dpkg -l | grep virtualbox-guest
lsmod | grep vboxguest
I've tried tried going to Settings > Display > Scale and increasing the scale to 200% to match my scaling in Windows. This does increase the size of the guest display, but not to the full screen and the mouse is still acting as if the entire screen is being used.
If I disable 3d acceleration, then the guest display uses the full screen, using software rendering.
If I lower the scaling in the windows host to 100%, then the guest display uses the full screen, but this won't work for me as all fonts, buttons etc are too small in the host.
I tried setting
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.\VBoxManage.exe setextradata "Mint" "CustomVideoMode1" "3840x2160x32"
It seems like I could hard set the resolution for the guest, but I'd like to avoid that as I sometimes move the guest to a second monitor that is only 1080p.
I've run out of things I can think to try. Any help would be greatly appreciated.