[Ubuntu-BR] Mensagem de erro no Ardour

[Vítor]

Olá a todos!
Comecei a receber uma mensagem de erro ao abrir o Ardour. É a seguinte:

WARNING: Your system has a limit for maximum amount of locked memory. This
might cause Ardour to run out of memory before your system runs out of
memory.

You can view the memory limit with 'ulimit -l', and it is normally
controlled by /etc/security/limits.conf


Alguém sabe o que vem a ser "locked memory" e para que serve? Será que eu
devo mexer neste arquivo?
A resposta ao comando "ulimit -l" é: "512000".
Eu abri o arquivo "limits.conf" e alterei o valor para 1048576 (eu tenho 1,5
GB de RAM), reiniciei e a mensagem continuou aparecendo.
Depois eu simplesmente apaguei a linha onde o valor aparece e novamente a
mensagem aparece.
Alguém tem alguma dica do que possa ser?

Grato.

Vítor


PS: Segue logo abaixo o meu "limits.conf":




# /etc/security/limits.conf
#
#Each line describes a limit for a user in the form:
#
#<domain>        <type>  <item>  <value>
#
#Where:
#<domain> can be:
#        - an user name
#        - a group name, with @group syntax
#        - the wildcard *, for default entry
#        - the wildcard %, can be also used with %group syntax,
#                 for maxlogin limit
#
#<type> can have the two values:
#        - "soft" for enforcing the soft limits
#        - "hard" for enforcing hard limits
#
#<item> can be one of the following:
#        - core - limits the core file size (KB)
#        - data - max data size (KB)
#        - fsize - maximum filesize (KB)
#        - memlock - max locked-in-memory address space (KB)
#        - nofile - max number of open files
#        - rss - max resident set size (KB)
#        - stack - max stack size (KB)
#        - cpu - max CPU time (MIN)
#        - nproc - max number of processes
#        - as - address space limit
#        - maxlogins - max number of logins for this user
#        - maxsyslogins - max number of logins on the system
#        - priority - the priority to run user process with
#        - locks - max number of file locks the user can hold
#        - sigpending - max number of pending signals
#        - msgqueue - max memory used by POSIX message queues (bytes)
#        - nice - max nice priority allowed to raise to
#        - rtprio - max realtime priority
#        - chroot - change root to directory (Debian-specific)
#
#<domain>      <type>  <item>         <value>
#

#*               soft    core            0
#*               hard    rss             10000
#@student        hard    nproc           20
#@faculty        soft    nproc           20
#@faculty        hard    nproc           50
#ftp             hard    nproc           0
#ftp             -       chroot          /ftp
#@student        -       maxlogins       4

# End of file
@audio - rtprio 99
@audio - memlock 512000