Some device (eg. hyperv_fb) will mimic EFI (or VESA) VGA on first boot
up, but after the real driver is loaded, it will switch to new mode
and no longer compatible with EFI/VESA VGA. Keep setting
orig_video_isVGA to EFI/VESA VGA flag will get wrong driver loaded and
try to manipulate the framebuffer in a wrong way.
As we have already take care of "VESA VGA" and "EFI VGA", just set the
orig_video_isVGA to 0 for any other driver reports as EFI/VESA VGA but
is not EFI/VESA VGA.
Signed-off-by: Kairui Song <kasong@xxxxxxxxxx>
---
kexec/arch/i386/x86-linux-setup.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kexec/arch/i386/x86-linux-setup.c b/kexec/arch/i386/x86-linux-setup.c
index dc785a2..a129812 100644
--- a/kexec/arch/i386/x86-linux-setup.c
+++ b/kexec/arch/i386/x86-linux-setup.c
@@ -152,6 +152,11 @@ static int setup_linux_vesafb(struct x86_linux_param_header *real_mode)
err = get_bootparam(&real_mode->orig_video_isVGA, offset, 1);
if (err)
goto out;
+
+ if (real_mode->orig_video_isVGA == 0x70 || real_mode->orig_video_isVGA == 0x23) {
+ /* Clear isVGA flag for fb drivers that mimic EFI/VESA VGA */
+ real_mode->orig_video_isVGA = 0;
+ }
}
close(fd);
--
2.19.1
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