linux-kernel - Re: Acer Aspire One now hangs on reboot/shutdown

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Message-ID: <w4sjr1v323.wl%peter@chubb.wattle.id.au>
Date:	Thu, 23 Jun 2011 09:50:28 +1000
From:	Peter Chubb <peter.chubb@...ta.com.au>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Peter Chubb <peter.chubb@...ta.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: Acer Aspire One now hangs on reboot/shutdown

>>>>> "Matthew" == Matthew Garrett <mjg59@...f.ucam.org> writes:

Matthew> On Wed, Jun 22, 2011 at 08:38:08PM +1000, Peter Chubb wrote:
>> 
>> Hi Matthew, GIT commit 660e34cebf0a11d54f2d5dd8838607452355f321
>> x86: reorder reboot method preferences causes my Acer Aspire One to
>> hang on shutdown/reboot.

Matthew> Also, shutdown? Really?

Sorry, shutdown -r (which is reboot really).


Writing the reset value `6' to the reset port 3321 in single user mode
makes the screen go blank, and the machine to become totally
unresponsive.  The power light remains on.  But the machine does *not*
reboot.

I've put up the ACPI tables at
http://www.cse.unsw.edu.au/~peterc/AspireOneACPI

The relevant part of the FADT is:
[074h 0116 12]               Reset Register : <Generic Address Structure>
[074h 0116  1]                     Space ID : 01 (SystemIO)
[075h 0117  1]                    Bit Width : 08
[076h 0118  1]                   Bit Offset : 00
[077h 0119  1]                 Access Width : 01
[078h 0120  8]                      Address : 0000000000000CF9

[080h 0128  1]         Value to cause reset : 06


--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia
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