linux-kernel - Re: [PATCH v2] drm/i915: Fix blank panel at reopening lid

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Date:	Sat, 11 Aug 2012 21:15:53 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Hugh Dickins <hughd@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Giacomo Comes <comes@...c.edu>,
	Paulo Zanoni <paulo.r.zanoni@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/i915: Fix blank panel at reopening lid

On Sat, Aug 11, 2012 at 08:56:42AM +0200, Takashi Iwai wrote:
> When you reopen the lid on a laptop with PCH, the panel suddenly goes
> blank sometimes.  It seems because BLC_PWM_CPU_CTL register is cleared
> to zero when BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1 registers are
> enabled.
> 
> This patch fixes the problem by moving the call of the function setting
> BLC_PWM_CPU_CTL after enabling other two registers.
> 
> Reported-and-tested-by: Hugh Dickins <hughd@...gle.com>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> ---
> v1->v2: add comments, fixed changelog
Picked up for -fixes, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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