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-rw-r--r--doc/guix.texi28
-rw-r--r--gnu/bootloader/grub.scm19
2 files changed, 41 insertions, 6 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index d674b9484f..3141c4582f 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -26101,9 +26101,22 @@ must @emph{not} be an OS device name such as @file{/dev/sda1}.
@end table
@end deftp
+@cindex HDPI
+@cindex HiDPI
+@cindex resolution
@c FIXME: Write documentation once it's stable.
-For now only GRUB has theme support. GRUB themes are created using
-the @code{grub-theme} form, which is not documented yet.
+For now only GRUB has theme support. GRUB themes are created using
+the @code{grub-theme} form, which is not fully documented yet.
+
+@deftp {Data Type} grub-theme
+Data type representing the configuration of the GRUB theme.
+
+@table @asis
+@item @code{gfxmode} (default: @code{'("auto")})
+The GRUB @code{gfxmode} to set (a list of screen resolution strings, see
+@pxref{gfxmode,,, grub, GNU GRUB manual}).
+@end table
+@end deftp
@defvr {Scheme Variable} %default-theme
This is the default GRUB theme used by the operating system if no
@@ -26114,6 +26127,17 @@ It comes with a fancy background image displaying the GNU and Guix
logos.
@end defvr
+For example, to override the default resolution, you may use something
+like
+
+@lisp
+(bootloader
+ (grub-configuration
+ ;; @dots{}
+ (theme (grub-theme
+ (inherit %default-theme)
+ (gfxmode '("1024x786x32" "auto"))))))
+@end lisp
@node Invoking guix system
@section Invoking @code{guix system}
diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index f13685ac9d..b99f5fa4f4 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -3,6 +3,7 @@
;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
+;;; Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -88,7 +89,9 @@ denoting a file name."
(color-normal grub-theme-color-normal
(default '((fg . cyan) (bg . blue))))
(color-highlight grub-theme-color-highlight
- (default '((fg . white) (bg . blue)))))
+ (default '((fg . white) (bg . blue))))
+ (gfxmode grub-gfxmode
+ (default '("auto")))) ;list of string
(define %background-image
(grub-image
@@ -149,8 +152,16 @@ system string---e.g., \"x86_64-linux\"."
;; most other modern architectures have no other mode and therefore don't
;; need to be switched.
(if (string-match "^(x86_64|i[3-6]86)-" system)
- "
- # Leave 'gfxmode' to 'auto'.
+ (string-append
+ "
+"
+ (let ((gfxmode (and=>
+ (and=> config bootloader-configuration-theme)
+ grub-gfxmode)))
+ (if gfxmode
+ (string-append "set gfxmode=" (string-join gfxmode ";"))
+ "# Leave 'gfxmode' to 'auto'."))
+ "
insmod video_bochs
insmod video_cirrus
insmod gfxterm
@@ -166,7 +177,7 @@ system string---e.g., \"x86_64-linux\"."
insmod vbe
insmod vga
fi
-"
+")
""))
(define (setup-gfxterm config font-file)