I tried adding a vga= setting to the kernel line in the grub configuration file, as recommended above. I put there vga=ask, and on boot I am asked to choose a VESA text mode (80*25, 80*50...). The text mode I choose is used for grub (which was looking alright before, too), but it doesn't change the scrambled display afterwards.
I tried adding a vga= setting to the kernel line in the grub configuration file, as recommended above. I put there vga=ask, and on boot I am asked to choose a VESA text mode (80*25, 80*50...). The text mode I choose is used for grub (which was looking alright before, too), but it doesn't change the scrambled display afterwards.