[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[PATCH v2 2/2] docs: Document efitextmode command

From: Glenn Washburn
Subject: [PATCH v2 2/2] docs: Document efitextmode command
Date: Fri, 13 May 2022 12:54:12 -0500

Signed-off-by: Glenn Washburn <>
 docs/grub.texi | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/docs/grub.texi b/docs/grub.texi
index 5de94d062..178957096 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -4049,6 +4049,7 @@ you forget a command, you can run the command 
 * distrust::                    Remove a pubkey from trusted keys
 * drivemap::                    Map a drive to another
 * echo::                        Display a line of text
+* efitextmode::                 Set/Get text output mode resolution
 * eval::                        Evaluate agruments as GRUB commands
 * export::                      Export an environment variable
 * false::                       Do nothing, unsuccessfully
@@ -4505,6 +4506,31 @@ character will print that character.
 @end deffn
+@node efitextmode
+@subsection efitextmode
+@deffn Command efitextmode [min | max | mode_num]
+When used with no arguments displays all available text output modes. The
+set mode determines the columns and rows of the text display when in
+text mode. An asterisk, @samp{*}, will be at the end of the line of the
+currently set mode.
+Otherwise the command only takes a single parameter, which can be
+@samp{min}, @samp{max}, or a mode number given by the listing when run
+with no arguments. These arguments set the mode to the minimum, maximum,
+and particular mode respectively.
+By default GRUB will start in whatever mode the EFI firmware defaults to.
+There are firmwares known to set up the default mode such that output
+behaves strangely, for example the cursor in the grub shell never reaches
+the bottom of the screen or, when typing characters at the prompt,
+characters from previous command output are overwritten. Setting the mode
+may fix this.
+Note: This command is only available on EFI platforms.
+@end deffn
 @node eval
 @subsection eval

reply via email to

[Prev in Thread] Current Thread [Next in Thread]