linux-kernel - EHCI powersave causes shutdown to freeze

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Date:	Thu, 24 Nov 2011 00:44:59 +0100
From:	Patrik Kullman <patrik.kullman@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: EHCI powersave causes shutdown to freeze

Hi,

After creating a powersave script based on PowerTOP Tunables, this
particular line prevented the system from being able to shutdown (Asus
Zenbook UX31E, kernels 3.0 - 3.1.2):

### Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced
Host Controller #1
echo auto > /sys/bus/pci/devices/0000:00:1d.0/power/control


Kernel prints the "Power Down." message but machine doesn't power down.

Is this a known bug?
Could this be fixed in the driver instead of:

echo on > /sys/bus/pci/devices/0000:00:1d.0/power/control

on system shutdown?
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