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From: Olaf Hering <olh@suse.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Cc: linuxppc-dev@ozlabs.org
Subject: AC Power handling broken for desktops
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My G4/450 runs without AC Power, according to /proc/pmu/info:

PMU driver version     : 2
PMU firmware version   : 0c
AC Power               : 0
Battery count          : 0

It should report 1. Where is the best place to get the
PMU_PWR_AC_PRESENT into ac_line_status?