Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1169041AbcKALrx (ORCPT ); Tue, 1 Nov 2016 07:47:53 -0400 Received: from mga06.intel.com ([134.134.136.31]:53458 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1169000AbcKALrw (ORCPT ); Tue, 1 Nov 2016 07:47:52 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,579,1473145200"; d="scan'208";a="780803255" From: Jani Nikula To: Martin Kepplinger , Joerg Roedel Cc: Linux kernel , torvalds@linux-foundation.org, daniel.vetter@intel.com Subject: Re: [BUG][REGRESSION] mangled display since -rc1 In-Reply-To: <79A6D00F-A07B-49B8-84D6-FB80E9D181FB@posteo.de> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <5d11d88ae7d77ce1c0adbc9e6ffc7633@posteo.de> <20161031152136.GA3473@suse.de> <6e267e2b-ddd2-8768-8fb5-72a1781c4cc1@posteo.de> <20161031215454.GB3473@suse.de> <79A6D00F-A07B-49B8-84D6-FB80E9D181FB@posteo.de> Date: Tue, 01 Nov 2016 13:47:44 +0200 Message-ID: <87k2cnjuan.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3672 Lines: 84 On Tue, 01 Nov 2016, Martin Kepplinger wrote: > Am 31. Oktober 2016 22:54:54 MEZ, schrieb Joerg Roedel : >>On Mon, Oct 31, 2016 at 09:44:51PM +0100, Martin Kepplinger wrote: >>> This is one machine booting a bad kernel. I could provide another >>> example later this week. >> >>You have an Intel system without any IOMMU (enabled), otherwise you >>would have a DMAR-ACPI table, but there is none: >> >>> [ 0.000000] ACPI: RSDP 0x00000000000FE020 000024 (v02 ACRSYS) >>> [ 0.000000] ACPI: XSDT 0x00000000A6FFE210 00008C (v01 ACRSYS >>ACRPRDCT 00000001 01000013) >>> [ 0.000000] ACPI: FACP 0x00000000A6FFB000 0000F4 (v04 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: DSDT 0x00000000A6FEC000 00B903 (v01 ACRSYS >>ACRPRDCT 00000000 1025 00040000) >>> [ 0.000000] ACPI: FACS 0x00000000A6FBB000 000040 >>> [ 0.000000] ACPI: FACS 0x00000000A6FBB000 000040 >>> [ 0.000000] ACPI: UEFI 0x00000000A6FFD000 000236 (v01 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: ASF! 0x00000000A6FFC000 0000A5 (v32 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: HPET 0x00000000A6FFA000 000038 (v01 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: APIC 0x00000000A6FF9000 00008C (v02 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: MCFG 0x00000000A6FF8000 00003C (v01 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: SLIC 0x00000000A6FEB000 000176 (v01 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: SSDT 0x00000000A6FEA000 0006FE (v01 ACRSYS >>ACRPRDCT 00001000 1025 00040000) >>> [ 0.000000] ACPI: BOOT 0x00000000A6FE8000 000028 (v01 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: ASPT 0x00000000A6FE3000 000034 (v07 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: FPDT 0x00000000A6FE1000 000044 (v01 ACRSYS >>ACRPRDCT 00000001 1025 00040000) >>> [ 0.000000] ACPI: SSDT 0x00000000A6FE0000 00079A (v01 ACRSYS >>ACRPRDCT 00003000 1025 00040000) >>> [ 0.000000] ACPI: SSDT 0x00000000A6FDF000 000A92 (v01 ACRSYS >>ACRPRDCT 00003000 1025 00040000) >> >>So it is pretty unlikely that any change in IOMMU code causes your >>issue. Not sure why your bisecting ended up there. You also have an >>Intel GPU in the system: >> >>> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation >>Core Processor Family Integrated Graphics Controller (rev 09) (prog-if >>00 [VGA controller]) >>> Subsystem: Acer Incorporated [ALI] Device 0748 >>> Flags: bus master, fast devsel, latency 0, IRQ 28 >>> Memory at c0000000 (64-bit, non-prefetchable) [size=4M] >>> Memory at b0000000 (64-bit, prefetchable) [size=256M] >>> I/O ports at 2000 [size=64] >>> [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] >>> Capabilities: >>> Kernel driver in use: i915 >> >>My best guess is that some changes in the i915 driver cause your issue, >>I add the maintainers of i915 to the cc-list, maybe they have an idea. >> >> >> Joerg > > > I'll come up with a nouveau system example and it was quite easy to bisect. To quote the merge commit msg: > > This also required some changes outside of the IOMMU code, but these are acked by the respective maintainers. > > Any help on bisecting into it would be awesome. So the information here is pretty scarce. Please file a bug at [1], describe the problem, perhaps add drm.debug=14 module parameter and attach dmesg from boot to reproducing the problem. BR, Jani. [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel -- Jani Nikula, Intel Open Source Technology Center