System Log

Hi,

I'm sorry to be dim about this, but I've always got by without the system
log before and now I suddenly need one quite urgently.

The relevant part of the configuration file (postgresql.conf) was:
#---------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#---------------------------------------------------------------------------

# - Syslog -

syslog = 2 # range 0-2; 0=stdout; 1=both; 2=syslog
syslog_facility = 'LOCAL0'
syslog_ident = 'postgres'

# - When to Log -

#client_min_messages = notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# log, info, notice, warning, error

#log_min_messages = notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error, log,
fatal,
# panic

#log_error_verbosity = default # terse, default, or verbose messages

#log_min_error_statement = panic # Values in order of increasing severity:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error,
panic(off)

#log_min_duration_statement = -1 # Log all statements whose
# execution time exceeds the value, in
# milliseconds. Zero prints all queries.
# Minus-one disables.

silent_mode = true # DO NOT USE without Syslog!

# - What to Log -

#debug_print_parse = false
#debug_print_rewritten = false
#debug_print_plan = false
#debug_pretty_print = false
#log_connections = false
#log_duration = false
#log_pid = false
#log_statement = false
#log_timestamp = false
#log_hostname = false
#log_source_port = false

That looks clear enough. The logging was switched off, so I've changed it
to:

#---------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#---------------------------------------------------------------------------

# - Syslog -

syslog = 2 # range 0-2; 0=stdout; 1=both; 2=syslog
syslog_facility = 'LOCAL0'
syslog_ident = 'postgres'

# - When to Log -

client_min_messages = notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# log, info, notice, warning, error

log_min_messages = notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error, log,
fatal,
# panic

log_error_verbosity = default # terse, default, or verbose messages

#log_min_error_statement = panic # Values in order of increasing severity:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error,
panic(off)

log_min_duration_statement = 0 # Log all statements whose
# execution time exceeds the value, in
# milliseconds. Zero prints all queries.
# Minus-one disables.

silent_mode = false # DO NOT USE without Syslog!

# - What to Log -

debug_print_parse = false
debug_print_rewritten = false
debug_print_plan = false
debug_pretty_print = false
log_connections = false
log_duration = false
log_pid = false
log_statement = false
log_timestamp = false
log_hostname = false
log_source_port = false

I then restarted the server. No difference. I'm assuming the log file is
postmaster.log.

I'm obviously missing something very simple. Any ideas?