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I'm using Ubuntu 12.04, and when Im in the GRUB Menu there are black edges both at top/bottom and left/right. The same way it is in the Plymouth Splash, but additionally Plymouth seems to be stretched like from 4:3 to 16:9.

I use an external AMD GPU and the propritary drivers.

Any ideas?

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up vote 0 down vote accepted
  • At that early stage in the boot process, both GRUB as well as the boot splash (Plymouth) use the basic VESA VBE video drivers and not the full-featured proprietary video driver.
  • Many modern video cards support only a limited number of VBE resolutions since they aren't really used with a graphical desktop any more, only for boot,etc.
  • Hence, the lower resolution used by GRUB/Plymouth manifests as a "smaller" screen size on your monitor
  • As long as your Ubuntu Desktop works fine, this "problem" isn't really worth bothering about, to be honest.
  • If you strongly believe your video card should support a full-resolution VBE mode, you can try telling GRUB that by editing the /etc/default/grub file and then running sudo update-grub:

    # The resolution used on graphical terminal
    # note that you can use only modes which your graphic card supports via VBE
    # you can see them in real GRUB with the command `vbeinfo'
    #GRUB_GFXMODE=640x480   # <--- Change this to your monitor's maximum resolution
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