Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753345AbYFOT3z (ORCPT ); Sun, 15 Jun 2008 15:29:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751045AbYFOT3p (ORCPT ); Sun, 15 Jun 2008 15:29:45 -0400 Received: from mga11.intel.com ([192.55.52.93]:55524 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750915AbYFOT3p convert rfc822-to-8bit (ORCPT ); Sun, 15 Jun 2008 15:29:45 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.27,648,1204531200"; d="scan'208";a="341343981" From: "Siddha, Suresh B" To: Frans Pop , "Rafael J. Wysocki" CC: Linux Kernel Mailing List , "Pallipadi, Venkatesh" , Ingo Molnar , "arjan@linux.intel.com" , "jbarnes@virtuousgeek.org" Date: Sun, 15 Jun 2008 12:29:24 -0700 Subject: RE: [Bug 10843] Display artifacts on XOrg logout with PAT kernel and VESA framebuffer Thread-Topic: [Bug 10843] Display artifacts on XOrg logout with PAT kernel and VESA framebuffer Thread-Index: AcjOagd1F/1ie1zFTdi22wigMb5M/wAskbCw Message-ID: <8B23168BCBB43B49A4C8EAB32D4B62F1061F3A82@orsmsx505.amr.corp.intel.com> References: <200806142359.36613.elendil@planet.nl> In-Reply-To: <200806142359.36613.elendil@planet.nl> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1432 Lines: 33 Frans Pop wrote: > On Saturday 14 June 2008, Rafael J. Wysocki wrote: > > The following bug entry is on the current list of known regressions > > from 2.6.25. Please verify if it still should be listed. > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10843 > > Subject : Display artifacts on XOrg logout with PAT kernel and VESA > > framebuffer > > Submitter : Frans Pop > > Date : 2008-05-31 14:04 (15 days old) > > References : http://lkml.org/lkml/2008/6/7/206 > > Yes. See also: http://lkml.org/lkml/2008/6/13/159 Frans, With or with out pat, in the recent kernels (like 2.6.26-rc4/rc5 etc), ioremap() uses UC- and PCI mmap of /sys/devices/pci.../resource (used by X) uses UC- And fb_mmap() also uses UC-. It's interesting that you don't see this artifact with "nopat". Essentially with or with out pat enabled, we use the same memory attributes. So depending on the MTRR setup (set by X server), effective memory attribute across different mappings should be same (which is UC- or WC with mtrr). Can you also check, if there is any impact with kernel boot param for vesafb "mtrr:3"? thanks, suresh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/