[bug #40552] GRUB misconfigures BIOS framebuffer as EFI

[Eli]

URL:
  <http://savannah.gnu.org/bugs/?40552>

                 Summary: GRUB misconfigures BIOS framebuffer as EFI
                 Project: GNU GRUB
            Submitted by: eliptus
            Submitted on: Tue 12 Nov 2013 01:52:08 AM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: other
         Reproducibility: None
         Planned Release: None

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Details:

I'm currently using grub-2.00_p5107-r2 on Gentoo.  Using GRUB's default
configuration, but setting "GRUB_GFXPAYLOAD_LINUX=1024x768" in
/etc/default/grub would result in a blank screen unless I enabled "efifb" in
the kernel.  This is unexpected since I'm running a  BIOS system and the
framebuffer is expected to use "vesafb".

As a test, I set "GRUB_VIDEO_BACKEND=true" in /etc/default/grub, disabling
GRUB's loading of it's video modules.  Doing so resulted in the kernel
correctly matching the framebuffer to the "vesafb" driver.  Further
experimentation showed that setting  "GRUB_VIDEO_BACKEND=vbe" also resulted in
the correct behavior. 

Using "all_video" or any other video module incorrectly resulted in matching
of "efifb".




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