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From: Fabio Coatti <fabio.coatti@gmail.com>
To: joeyli <jlee@suse.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>, Bob Moore <robert.moore@intel.com>,
        Feng Tang <feng.tang@intel.com>, Len Brown <len.brown@intel.com>,
        Tom St Denis <tstdenis@elliptictech.com>, linux-kernel@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression?
Date: Mon, 14 Jan 2013 12:26:47 +0100
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In data lunedì 14 gennaio 2013 17:50:59, joeyli ha scritto:
> 於 一，2013-01-14 於 09:13 +0100，Fabio Coatti 提到：
> 
> > While looking at a different issue (rfkill), related to this commit:
> > ====
> > 
> > > a57f7f9175b8ccbc9df83ac13860488913115de4 is the first bad commit
> > > commit a57f7f9175b8ccbc9df83ac13860488913115de4
> > > Author: Bob Moore <robert.moore@intel.com>
> > > Date: Fri Aug 17 10:55:02 2012 +0800
> > > 
> > > ACPICA: Add Windows8/Server2012 string for _OSI method.
> > > This change adds a new _OSI string, "Windows 2012" for both Windows 8
> > > and Windows Server 2012.
> > > 
> > > >From Microsoft document "How to Identify the Windows Version in ACPI
> > > 
> > > by Using _OSI", July 13, 2012.
> > > 
> > > Signed-off-by: Bob Moore <robert.moore@intel.com>
> > > Signed-off-by: Feng Tang <feng.tang@intel.com>
> > > Signed-off-by: Len Brown <len.brown@intel.com>
> > 
> > ====
> > 
> > I discovered that reverting this commit (or, as suggested by joeyli
> > <jlee@suse.com>, booting with acpi_osi="!Windows 2012" ) also fixes
> > the brightness issue. So it seems related to the same ACPI issue, now
> > I wonder how it's happened that I got the wrong commit while
> > bisecting. Sorry for the noise, now the issue is still there but makes
> > more sense ):)
> 
> Use "!Windows 2012" can fallback to Windows 2009 mode for workaround
> rkfill button and brightness issue on your machine, but we still have
> problem with Windows 2012 mode.
> 
> That means we need spend more time to trace the dsdt stuff for guess
> what's behavior on HP machine with Windows 8.
> 
> 
> Thanks a lot!
> Joey Lee

Just let me know if I can help in some way (always available for testing).

Many thanks.


--
Fabio