Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE

From	Francesco Poli <invernomuto@paranoici.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE
Date	2025-10-18 13:20 +0200
Message-ID	<LHd8B-66w7-9@gated-at.bofh.it> (permalink)
References	(8 earlier) <LpPFo-bJIJ-1@gated-at.bofh.it> <LEL6O-4qan-7@gated-at.bofh.it> <LGT0d-5SPL-9@gated-at.bofh.it> <LpPFo-bJIJ-1@gated-at.bofh.it> <LGT0d-5SPL-9@gated-at.bofh.it>
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On Fri, 17 Oct 2025 15:44:21 +0200 Salvatore Bonaccorso wrote:

> Control: tags -1 + moreinfo
> 
> Hi Francesco,

Hello Salvatore,

> 
> On Sat, Oct 11, 2025 at 06:50:06PM +0200, Francesco Poli wrote:
[...]
> >      $ git checkout v6.13-rc6
> >      $ make CC=gcc-14 my_defconfig
> >      $ make CC=gcc-14 -j 4 bindeb-pkg
> >      ---------> v6.13-rc6 is good (which is unexpected!)
> > 
> > 
> > 
> > What should we deduce from this unexpected result?
[...]
> > What do you suggest to do, next?
> 
> The suspsect is that you see difference as you end in the self
> compiled kernel without enabled IOMMU. (Background; The Debian config
> has CONFIG_INTEL_IOMMU_DEFAULT_ON_INTGPU_OFF=y, ntoably this option
> does not exist in upstream, so you end with
> CONFIG_INTEL_IOMMU_DEFAULT_ON not set only and see the difference.
> (if you want to look up what I'm talking, this is
> features/x86/intel-iommu-add-kconfig-option-to-exclude-igpu-by-default.patch
> in the source).
> 
> before we might suggest you need to use the workaround to disable
> iommu, can you please now test the *selfcompiled* v6.13-rc6 with IOMMU
> enabled, by booting it with the kernel command line argument
> intel_iommu=on. I expect you will see then the problem in same way.

Yes, I can confirm.

  $ cat /proc/cmdline 
  BOOT_IMAGE=/boot/vmlinuz-6.13.0-rc6 root=UUID=a5d36947-d90d-4818-9184-7cda88ade7fd ro quiet

This is good.


  $ cat /proc/cmdline 
  BOOT_IMAGE=/boot/vmlinuz-6.13.0-rc6 root=UUID=a5d36947-d90d-4818-9184-7cda88ade7fd ro intel_iommu=on quiet

This is bad: no audio output or input and the usual flood of
error messages in /var/log/kern.log

  kernel: DMAR: DRHD: handling fault status reg 3
  kernel: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] fault addr 0xffa01000 [fault reason 0x0c] non-zero reserved fields in PTE



Please let me know how to proceed.
Thanks for your kind assistance!
  

-- 
 http://www.inventati.org/frx/
 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE

Thread

Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE "Francesco Poli (wintermute)" <invernomuto@paranoici.org> - 2025-08-31 14:50 +0200
  Processed: Re: Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel  audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0]  ... non-zero reserved fields in PTE "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-09-06 14:00 +0200
  Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-09-06 14:00 +0200
    Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-09-07 13:20 +0200
      Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-09-29 23:10 +0200
  Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-10-05 18:50 +0200
  Processed: Re: Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel  audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0]  ... non-zero reserved fields in PTE "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-10-05 21:00 +0200
  Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-10-05 21:30 +0200
    Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-10-11 17:30 +0200
      Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-10-11 19:00 +0200
        Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-10-17 15:50 +0200
          Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-10-18 13:20 +0200
            Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-10-25 17:00 +0200
              Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-10-25 17:40 +0200
                Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-10-26 14:10 +0100
              Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-10-26 23:40 +0100
                Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-11-06 00:00 +0100
                Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-11-11 13:50 +0100
                Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-11-12 22:50 +0100
                Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-11-16 17:50 +0100
  Processed: Re: Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel  audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0]  ... non-zero reserved fields in PTE "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-10-17 15:50 +0200
  Processed: Re: Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel  audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0]  ... non-zero reserved fields in PTE "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-10-25 17:00 +0200
  Bug#1112627: marked as done (linux-image-6.16.3+deb14-amd64:  Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device  [00:1b.0] ... non-zero reserved fields in PTE) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-11-20 13:20 +0100
  Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Francesco Poli <invernomuto@paranoici.org> - 2025-11-24 23:40 +0100
    Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE Salvatore Bonaccorso <carnil@debian.org> - 2025-11-26 08:50 +0100

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