linux-kernel - Re: [PATCH] drm/i915: Fix invalid backpanel values for GEN3 or older chips

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Message-ID: <yunsjlnl1f6.fsf@aiko.keithp.com>
Date:	Wed, 16 Nov 2011 22:15:41 -0800
From:	Keith Packard <keithp@...thp.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Daniel Mack <zonque@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Jesse Barnes <jbarnes@...tuousgeek.org>, harald@...hat.com,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Fix invalid backpanel values for GEN3 or older chips

On Wed, 16 Nov 2011 18:14:55 +0100, Takashi Iwai <tiwai@...e.de> wrote:

> While refactoring of backlight control code in commit [a95735569:
> drm/i915: Refactor panel backlight controls], the handling of the bit
> 0 of duty-cycle was gone except for pineview.  This resulted in invalid
> register values for old chips like 915GM.  When the bit 0 is set, the
> backlight is turned off suddenly.

I'm looking at the mentioned patch and I don't see how that managed to
correctly handle bit 0; is this the patch that managed to break this?

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

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