Note: pbbuttons with IPC problems
I've had a very strange problem. gtkpbbuttons and pbbcmd report
$ LANG=C pbbcmd query SLEEPKEY
ERROR: Problems with IPC, maybe server is not running.
$ LANG=C gtkpbbuttons -a /dev/sound/dsp
ERROR: Can't create message port for client.
The cause was, there were not enough IPC channels. A simple
echo 32 > /proc/sys/kernel/msgmni
helped. An entry in /etc/sysctl.conf is for permanence.
Hope this information helps someone sometime.
Computer Science is no more about Computers than astronomy is about
-- Edsger Wybe Dijkstra