LOCK_SCREEN= seems to be inoperative in /etc/default/acpi-support

LOCK_SCREEN=false in /etc/default/acpi-support (or just commenting out the original LOCK_SCREEN=true) doesn't seem to work.
It still locks the screen no matter what the LOCK_SCREEN condition is when I resume from suspend.
I did reboot after editing that parameter although I think that restarting acpid and acpi-support in /etc/init.d would have sufficed.

Am I overlooking something?

Thanks ... Richard

My /etc/default/acpid file:

# Specify options for acpid startup, Debian default is to enable the
# use of sockets at a non-default position
OPTIONS="-s /var/run/acpid.socket"

# Specify modules to load on acpid's startup
# MODULES may be uncommented to load "none", contain the string "all"
# to load all acpi related modules or simply a space seperated list
# of modules to be probed.
#MODULES="battery ac processor button fan thermal"
# using all allows us to drop extra modules in drivers/acpi and have them
# be autoloaded.
MODULES="all"

My /etc/default/acpi-support file:

# Comment the next line to disable ACPI suspend to RAM
ACPI_SLEEP=true

# Comment the next line to disable suspend to disk
ACPI_HIBERNATE=true

# Change the following to "standby" to use ACPI S1 sleep, rather than S3.
# This will save less power, but may work on more machines
ACPI_SLEEP_MODE=mem

# Add modules to this list to have them removed before suspend and reloaded
# on resume. An example would be MODULES="em8300 yenta_socket"
#
# Note that network cards and USB controllers will automatically be unloaded
# unless they're listed in MODULES_WHITELIST
MODULES="fglrx"

# Add modules to this list to leave them in the kernel over suspend/resume
MODULES_WHITELIST=""

# Should we save and restore state using the VESA BIOS Extensions?
SAVE_VBE_STATE=true

# The file that we use to save the vbestate
VBESTATE=/var/lib/acpi-support/vbestate

# Should we attempt to warm-boot the video hardware on resume?
POST_VIDEO=true

# Save and restore video state?
#SAVE_VIDEO_PCI_STATE=true

# Should we switch the screen off with DPMS on suspend?
USE_DPMS=true

# Use Radeontool to switch the screen off? Seems to be needed on some machines
# RADEON_LIGHT=true

# Uncomment the next line to switch away from X and back again after resume.
# This is needed for some hardware, but should be unnecessary on most.
# DOUBLE_CONSOLE_SWITCH=true

# Set the following to "platform" if you want to use ACPI to shut down
# your machine on hibernation
HIBERNATE_MODE=shutdown

# Comment this out to disable screen locking on resume
LOCK_SCREEN=false

# Uncomment this line to have DMA disabled before suspend and reenabled
# afterwards
# DISABLE_DMA=true

# Uncomment this line to attempt to reset the drive on resume. This seems
# to be needed for some Sonys
# RESET_DRIVE=true

# Add services to this list to stop them before suspend and restart them in
# the resume process.
STOP_SERVICES=""

# Restart Infra Red services on resume - off by default as it crashes some
# machines
RESTART_IRDA=false

# Switch to laptop-mode on battery power - off by default as it causes odd
# hangs on some machines
ENABLE_LAPTOP_MODE=false

# Spindown time on battery
SPINDOWN_TIME=12