linux-kernel - Re: [PATCH] acpi/video: Don't restore backlight to 0 at boot time

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Message-ID: <20120524132443.GA21231@srcf.ucam.org>
Date:	Thu, 24 May 2012 14:24:43 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	linux-kernel@...r.kernel.org, Bdale Garbee <bdale@....com>
Subject: Re: [PATCH] acpi/video: Don't restore backlight to 0 at boot time

On Thu, May 24, 2012 at 12:13:40AM -0700, Keith Packard wrote:
> Matthew Garrett <mjg59@...f.ucam.org> writes:
> 
> > ACPI arguably does define 0 as being off (this is exceedingly poorly 
> > defined), but I'm not entirely happy with this - the firmware makes its 
> > behaviour conditional on the OS version. I'd really like to see an 
> > updated version of the Intel opregion spec to get a better idea of what 
> > we're meant to be doing here, but the last one made public was
> > ancient.
> 
> Kernel 3.4 continues to break on this machine; I'd love to know how to
> get a suitable fix upstreamed...


Still waiting for that spec.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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