GRUB 2 likes its PMG files in RGBA flavour.

diff --git a/bootloader/Makefile b/bootloader/Makefile
index 023804f18890e3503f1dbb00e6ca0e840fcd462e..c0fc9dea70ec4167cb2b491c5e2e9067b952bec0 100644 (file)
--- a/bootloader/Makefile
+++ b/bootloader/Makefile
@@ -14,10 +14,11 @@ BOOTLOADER_BACKGROUND_OUT = background.png
 all: $(BOOTLOADER_BACKGROUND_OUT)
 
 $(BOOTLOADER_BACKGROUND_OUT): $(BOOTLOADER_BACKGROUND_IN)
-       convert $< $@
+       # GRUB2 requires the RGBA format.
+       convert $< PNG32:$@
 
 install: $(BOOTLOADER_BACKGROUND_OUT)
-       -mkdir pv $(GRUB_THEME_PATH)
+       -mkdir -pv $(GRUB_THEME_PATH)
        install -m 644 $< $(GRUB_THEME_PATH)
 
 clean: