swap out in linux 2.6.x using 1.1.6 agent

[bbrendon]

web1:/etc/zabbix# zabbix_agent --test system.swap.out[,pages]
system.swap.out[,pages]                       [m|ZBX_NOTSUPPORTED]
web1:/etc/zabbix# uname -a
Linux web1 2.6.18-3-amd64 #1 SMP Mon Dec 4 17:04:37 CET 2006 x86_64 GNU/Linux
web1:/etc/zabbix#

According to the 1.1.5 release notes, this should be working, no?