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[bug #49814] vbe does not reset display start

From: Stas Sergeev
Subject: [bug #49814] vbe does not reset display start
Date: Thu, 6 Apr 2017 08:02:31 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0

Follow-up Comment #4, bug #49814 (project grub):

I think grub restores the display start only
when the boot happens in graphics mode. In fact,
I wasn't able to reproduce the problem in that
case. The bug happens only if grub works in gfx
mode but the boot happens in text mode.
In this case, when the app under booted OS activates
the video mode that was previously used by grub,
then, out of sudden, display_start appears to be
the one that grub have left.
As I initially said, this is not a grub's bug -
video bios should not preserve any values across
mode switching. Unfortunately the buggy bios does
exactly this, and grub can provide a work-around
by resetting display_start even when it is going
to switch to text mode.
So could you please confirm if grub resets the
display_start even before the text-mode boot?


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