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I have put those lines into /etc/default/grub:

GRUB_GFXMODE=1920x1080x32
GRUB_GFXPAYLOAD_LINUX=1920x1080x32

(of course, update-grub was done after that)

However, GRUB doesn't look right - it has black margins around, renders noticably slow (takes about 1-2 seconds to fill the screen), and the font looks weird - it feels like it makes 1920x1080 image but tries to fit it into a smaller resolution.

After installing Nvidia proprietary drivers, the problem also applies to plymouth.

If I type vbeinfo in GRUB's console, it does list 1920x1080 with 32-bit color mode.

What can I try to fix it?

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