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

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Message-ID: <86ehqajbkr.fsf@sumi.keithp.com>
Date:	Thu, 24 May 2012 00:13:40 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-kernel@...r.kernel.org, Bdale Garbee <bdale@....com>
Subject: Re: [PATCH] acpi/video: Don't restore backlight to 0 at boot time

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...

-- 
keith.packard@...el.com

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