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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