Currently in grub 1.98 if a user enables the GRUB_HIDDEN_TIMEOUT entry
in /etc/default/grub. The following code will be executed from
/etc/grub.d/00_header.
if sleep$verbose --interruptible ${GRUB_HIDDEN_TIMEOUT} ; then
set timeout=${GRUB_TIMEOUT}
fi
That code performs the hidden timeout. Either when it expires, or is
aborted with a key, it will start the regular timeout also. This
behavior can be reproduced.
Here is a patch that changes that ${GRUB_TIMEOUT} to 0.
More info here: https://savannah.gnu.org/bugs/?29250
diff -ur grub-1.98.orig/util/grub.d/00_header.in grub-1.98/util/grub.d/00_header.in
--- grub-1.98.orig/util/grub.d/00_header.in 2010-03-11 00:36:05.766730374 -0400
+++ grub-1.98/util/grub.d/00_header.in 2010-03-11 00:40:49.046203888 -0400
@@ -150,7 +150,7 @@
fi
cat << EOF
if sleep$verbose --interruptible ${GRUB_HIDDEN_TIMEOUT} ; then
- set timeout=${GRUB_TIMEOUT}
+ set timeout=0
fi
EOF
else
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