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-rw-r--r--doc/guix.texi28
1 files changed, 26 insertions, 2 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}