serial console support broken (bug #12922)

I submitted this a few weeks ago in the bug tracking system on the
grub homepage so apologies if posting here is a breach of etiquette.

Anyway, my grub serial console isn't working, does anyone have any
ideas?  This seems like a bug in grub unless I'm missing something:

I have a system connected to a serial console and a display. OS is
Fedora Core 1 with the .93-7 grub rpm installed. My grub.conf:

serial --unit=0 --speed=9600
terminal --timeout=10 serial console
default=0
timeout=15
splashimage=(hd0,0)/grub/splash.xpm.gz
title Fedora Core (2.6.10-0.ti.4.fc1)
kernel /vmlinuz-2.6.10-0.ti.4.fc1 ro root=LABEL=/ acpi=on selinux=0 vdso=0 
exec-shield=0 console=tty0 console=ttyS0,9600
initrd /initrd-2.6.10-0.ti.4.fc1.img
title Fedora Core (2.6.10-0.ti1.fc1)
kernel /vmlinuz-2.6.10-0.ti1.fc1 ro root=LABEL=/ acpi=on selinux=0 vdso=0 
exec-shield=0 console=tty0 console=ttyS0,9600
initrd /initrd-2.6.10-0.ti1.fc1.img
title Memtest86+ (1.55.1)
kernel /memtest86+-1.55.1

On boot, grub prints the 'press any key to continue' message on both
the serial console and the display, as expected. However, pressing a
key on the serial console does not have the intended result (which
would be for the menu to appear on the serial console). Instead, grub
stops printing 'press any key to continue' messages, waits a few
moments, then just starts booting the default image. For some reason,
the menu is not displayed and I can't pick a different boot image.

This works fine on the display - pressing a key there results in the
menu appearing.

I suspect this is related to the hiddenmenu or possibly this bug:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=134029

Any idea why the menu is not displayed? As you can see, we aren't
using hiddenmenu.

Thanks,
P.

-- 
Philip J. Hollenback
Telemetry Investments
phollenback@xxxxxxxxxxxxxxxxxxxxxxxxx