From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Fan resume not working on nx6325 without userland assistance
Date: Tue, 22 Jan 2008 02:41:42 +0100
Message-ID: <200801220241.43230.rjw@sisk.pl>
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To: Len Brown <lenb@kernel.org>
Cc: ACPI Devel Maling List <linux-acpi@vger.kernel.org>, Alexey Starikovskiy <astarikovskiy@suse.de>

Hi,

It turns out that the following script (from openSUSE 10.3):

#############################################################
# triggers the ACPI fan(s) after resume. Since ACPI drivers
# have no suspend support, this is sometimes necessary.
# see http://article.gmane.org/gmane.linux.acpi.devel/16643
kick-fan()
{
        local FAN DUMMY STATE
        for FAN in /proc/acpi/fan/*/state; do
                [ ! -e $FAN ] && continue
                read DUMMY STATE < $FAN
                if [ "$STATE" = "on" ]; then
                        echo "kicking $FAN"
                        echo -n 3 > $FAN
                        echo -n 0 > $FAN
                fi
        done
}

case $1 in
        thaw|resume)
                kick-fan
                ;;
esac

is necessary to make the fan behave appropriately after a resume from RAM
(I haven't checked resume from hibernation, but I guess the same thing happens)
on HP nx6325 with 2.6.24-rc8 (and with previous kernels probably too).

It wasn't needed at one point, so something has regressed.  Sigh.

Greetings,
Rafael