From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: [PATCH v2] drm/i915: Fix shifted screen on top of LVDS on IVY laptop Date: Tue, 11 Dec 2012 12:54:11 +0100 Message-ID: <20121211115411.GQ11556@phenom.ffwll.local> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ea0-f177.google.com (mail-ea0-f177.google.com [209.85.215.177]) by gabe.freedesktop.org (Postfix) with ESMTP id 9127FE628E for ; Tue, 11 Dec 2012 03:52:40 -0800 (PST) Received: by mail-ea0-f177.google.com with SMTP id c10so1448012eaa.36 for ; Tue, 11 Dec 2012 03:52:39 -0800 (PST) Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: Takashi Iwai Cc: Arthur Ranyan , intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org On Tue, Dec 11, 2012 at 11:46:29AM +0100, Takashi Iwai wrote: > The commit [23670b322: drm/i915: CPT+ pch transcoder workaround] > caused a regression on some HP laptops with IvyBridge. The whole > laptop screen is shifted downward for a few pixels constantly. > The problem appears only on LVDS while DP and VGA seem unaffected. > Also, the problem disappears once when go and back from S3. > (S4 resume still shows the same problem.) > > This patch revives the minimum part the commit above dropped. > For fixing this regression, only the setup of CHICKEN2 bit in > cpt_init_clock_gating() is needed. > > Signed-off-by: Takashi Iwai Picked up for -fixes, thanks for the patch. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch