menu: Make graphics: no an alias for serial: yes on EFI

CONFIG.md

@@ -97,8 +97,8 @@ Miscellaneous:
   named `Arch Linux`). If unspecified, it is `1`.
 * `remember_last_entry` - If set to `yes`, remember last booted entry.
   (UEFI only).
-* `graphics` - If set to `no`, force CGA text mode for the boot menu, else use
-  a video mode. Ignored with Limine UEFI.
+* `graphics` - If set to `no`, force text mode for the boot menu, else use
+  a video mode.
 * `wallpaper` - Path to a file to use as a wallpaper. BMP, PNG, and JPEG
   formats are supported. There can be multiple of this option, in which case
   the wallpaper will be randomly selected from the provided options.

common/menu.c

@@ -1009,6 +1009,15 @@ noreturn void _menu(bool first_run) {
 #endif
         serial_str != NULL && strcmp(serial_str, "yes") == 0;
 
+#if defined (UEFI)
+    if (!serial) {
+        char *graphics_str = config_get_value(NULL, 0, "GRAPHICS");
+        if (graphics_str != NULL && strcmp(graphics_str, "no") == 0) {
+            serial = true;
+        }
+    }
+#endif
+
 #if defined (BIOS)
     if (serial) {
         char *baudrate_s = config_get_value(NULL, 0, "SERIAL_BAUDRATE");