From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Nicolas Kalkhof" Subject: Re: gen6 (SNB) depthbuffer issue with OpenGL games Date: Tue, 19 Jul 2011 21:18:23 +0200 (CEST) Message-ID: <830694266.3226696.1311103103395.JavaMail.fmail@mwmweb002> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1875537458==" Return-path: Received: from fmmailgate05.web.de (fmmailgate05.web.de [217.72.192.243]) by gabe.freedesktop.org (Postfix) with ESMTP id B1FE29ECF1 for ; Tue, 19 Jul 2011 12:18:24 -0700 (PDT) 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: Safety0ff , intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org --===============1875537458== Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: 7bit Hi,
absolutely correct! I've experienced this issue the same way you described during the 2.6.39-rc series in random occurance but much less intensive. however it disappeared during the 3.0-rc series. now the depth/alpha issue occurs instantly after starting the OGL app. I'll try to nail down the bad commit.

regards,
nic

Von: Safety0ff <safety0ff.bugz@gmail.com>
Gesendet: Jul 19, 2011 5:12:15 PM
An: intel-gfx@lists.freedesktop.org
Betreff: Re: [Intel-gfx] gen6 (SNB) depthbuffer is sue with OpenGL games

On 19/07/11 02:58 PM, Nicolas Kalkhof wrote:

I've experienced a strange depth buffer issue recently with OpenGL games (see attached screenshots). It seems that the depth buffer fails on some pixels. This problem was introduced somewhere between Kernel-3.0.0-rc6-git6 and kernel-3.0.0-rc7. Both xf-86-video-intel and mesa are latest git. Could someone please look into it?

I've experienced this issue far earlier than the version stated above (i.e. with 2.39 rc's using mesa and xf86-video-intel from git from that time period).
It does not occur constantly in my case, just randomly, and not necessarily from application start (i.e. it sometimes started after it had been running a short period of time).

I would have mentioned this earlier if I wasn't having ram issues which make it difficult to have any certainty about problems which occur randomly.

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