pm-utils 1.4.0-1
on 2.6.36 Arch (64Bit)

When I use pm-utils from console or the KDE menu entry the screen goes black for a very short time but the system is coming back again immediately.

There's an error message in /var/log/pm-suspend.log:
/usr/lib/pm-utils/pm-functions: line 297: echo: write error: No such file or directory

The line that is mentioned:

if [ -z "$SUSPEND_MODULE" ]; then
    if grep -q mem /sys/power/state; then
        SUSPEND_MODULE="kernel"
        do_suspend() { echo -n "mem" >/sys/power/state; } -->Line 297<--
    elif [ -c /dev/pmu ] && pm-pmu --check; then
        SUSPEND_MODULE="kernel"
        do_suspend() { pm-pmu --suspend; }
    elif grep -q standby /sys/power/state; then
        SUSPEND_MODULE="kernel"
        do_suspend() { echo -n "standby" >/sys/power/state; }
    fi
fi

I've checked if the file is present:
$ cat /sys/power/state
mem disk

Two other people have the same problem here:
https://bbs.archlinux.org/viewtopic.php?id=107046

Thanks in advance!