From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 19 Sep 2025 13:32:29 +0000 (+0200)
Subject: boot: let's make the one space we output early on invisible
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F39026%2Fhead;p=thirdparty%2Fsystemd.git

boot: let's make the one space we output early on invisible

let's place the cursor at the beginning of the line before/after, so we
know it's the first char we overwrite, and we return to the front again
right after.
---

diff --git a/src/boot/boot.c b/src/boot/boot.c
index 0c88b05a413..b168eba01c5 100644
--- a/src/boot/boot.c
+++ b/src/boot/boot.c
@@ -495,8 +495,9 @@ static bool menu_run(
         ST->ConIn->Reset(ST->ConIn, false);
         ST->ConOut->EnableCursor(ST->ConOut, false);
 
-        /* draw a single character to make ClearScreen work on some firmware */
-        ST->ConOut->OutputString(ST->ConOut, (char16_t *) u" ");
+        /* Draw a single character to the beginning of a line, in order to make ClearScreen() work on certain
+         * broken firmware. And let's immediately move back to the beginning of the line. */
+        printf("\r \r");
 
         err = console_set_mode(config->console_mode_efivar != CONSOLE_MODE_KEEP ?
                                config->console_mode_efivar : config->console_mode);