From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1168917AbcKAL11 (ORCPT ); Tue, 1 Nov 2016 07:27:27 -0400 Received: from mout02.posteo.de ([185.67.36.66]:52702 "EHLO mout02.posteo.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1168775AbcKAL1W (ORCPT ); Tue, 1 Nov 2016 07:27:22 -0400 In-Reply-To: <20161031215454.GB3473@suse.de> References: <5d11d88ae7d77ce1c0adbc9e6ffc7633@posteo.de> <20161031152136.GA3473@suse.de> <6e267e2b-ddd2-8768-8fb5-72a1781c4cc1@posteo.de> <20161031215454.GB3473@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Subject: Re: [BUG][REGRESSION] mangled display since -rc1 From: Martin Kepplinger Date: Tue, 01 Nov 2016 12:27:15 +0100 To: Joerg Roedel CC: Linux kernel , torvalds@linux-foundation.org, daniel.vetter@intel.com, jani.nikula@linux.intel.com Message-ID: <79A6D00F-A07B-49B8-84D6-FB80E9D181FB@posteo.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.