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I am trying to somehow control the graphics I get for the very first screen I get with and encrypted install. GRUB menu I can control the settings, but for the very first screen I get (binary from /efi) I can't seem to find a way. The default is not centered and correctly sized.
I did try using --themes=starfield (default theme) with grub-install but didn't change anything for the very first screen where I unlock /boot with the encryption passphrase. I moved the starfield theme files to /efi and it works for the GRUB menu.
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I also tried plymouth but that works for the passphrase input screen when unlocking / after the grub kernel selection menu.
I suppose grub-install doesn't correctly include the theme in the image file? I tried looking for grub-mkimage flags but I didn't find any theme related stuff. Should grub-install read the theme location from /etc/default/grub? The theme files are on the /efi partition so they should be accessible before unlocking any partition.
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Ok so I managed to make it work, but it's not worth it in the end. I didn't realize this, but in GRUB on high res (2560x1440 in my case) the drawing of the screen is crazy slow. I had to type the passphrase real slow so the keys would register.
The issue is that there's no passphrase for the graphical menu, and once I select the kernel plymouth takes over, and when I need to unlock / there's no issue with screen rendering. But in GRUB it's real slow on high res, especially if you want to type your passphrase fast.
I managed to increase the resolution by rebuilding the core image with grub-mkimage and some options.
Any way of making grub render faster in high res?
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