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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Fri, 28 Jan 2022 11:30:33 +0100
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Subject: [PATCH] EFI: suppress the "Welcome to GRUB!" message in EFI builds
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Grub EFI builds are now often used in combination with flicker-free
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boot, but this breaks with upstream grub because the "Welcome to GRUB!"
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message will kick the EFI fb into text mode and show the msg,
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breaking the flicker-free experience.
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EFI systems are so fast, that when the menu or the countdown are enabled
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the message will be immediately overwritten, so in these cases not
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printing the message does not matter.
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And in case when the timeout_style is set to TIMEOUT_STYLE_HIDDEN,
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the user has asked grub to be quiet (for example to allow flickfree
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boot) annd thus the message should not be printed.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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grub-core/kern/main.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/grub-core/kern/main.c b/grub-core/kern/main.c
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index 3fc3401472..993b8a8598 100644
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--- a/grub-core/kern/main.c
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+++ b/grub-core/kern/main.c
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@@ -317,10 +317,13 @@ grub_main (void)
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grub_boot_time ("After machine init.");
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+ /* This breaks flicker-free boot on EFI systems, so disable it there. */
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+#ifndef GRUB_MACHINE_EFI
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/* Hello. */
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grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
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grub_printf ("Welcome to GRUB!\n\n");
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grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
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+#endif
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/* Init verifiers API. */
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grub_verifiers_init ();
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