I’ve installed 12.3 in my notebook and it works perfectly, except one problem: I’ve connect my notebook with a monitor while I was installing the system. Now I found that if I remove the connect from the monitor, the grub screen (menu for selecting which system we would like to login) looks very large and streached, I am just wondering, how can we solve this problem?
I doubt reinstallation of bootloader will change anything. I’d rather suspect system BIOS that tries to stretch standard resolution to fill the whole (wide-)screen. I see more or less the same on my notebook during Windows boot.