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

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Date:	Tue, 3 Jan 2012 22:19:54 +0000
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

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.

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