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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

Cross-posted to 2 groups.

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Hi,

On Wed, Nov 12, 2025 at 10:44:00PM +0100, Francesco Poli wrote:
> On Tue, 11 Nov 2025 13:44:23 +0100 Salvatore Bonaccorso wrote:
> 
> [...]
> > On Wed, Nov 05, 2025 at 11:52:55PM +0100, Francesco Poli wrote:
> [...]
> > >  * if I enable VT-d, audio fails to work
> > > 
> > >  * if I disable VT-d, audio works correctly
> [...]
> > > Now I have some questions:
> > > 
> > >  - is disabling VT-d in the BIOS settings equivalent to booting with
> > >    intel_iommu=off kernel parameter?
> > 
> > Yes, this result is equivalent.
> 
> OK, good to know.
> 
> > 
> > >  - I thought that enabling VT-d was needed for QEMU in KVM mode, but I
> > >    cannot verify it (starting 'kvm' seems to work, without any visible
> > >    complaint): could you please tell me what I am missing, by disabling
> > >    VT-d?
> > 
> > It depends on which use cases you have for the VMs. Do you need to
> > passh through hardware?
> 
> Things like GPU pass-through?
> Do I understand correctly that it requires at least two GPUs in the
> box?
> I only have the graphics integrated in the Intel CPU, hence, if GPU
> pass-through indeed requires two GPUs, I am not going to need GPU
> pass-through anytime soon... Probably I'll never use it on this box...
> 
> Is there any other relevant pass-through thing, besides GPU
> pass-through? 
> 
> > Do you use nested virtualization?
> 
> VMs running within the VM which is running on the bare metal?
> I have never used it. I don't know whether I will need it in the
> future, but I guess I won't. At least, not in the short/medium term...
> 
> > 
> > >  - does this additional information help in understanding the issue
> > >    and, perhaps, in fixing it?
> > 
> > That is still the harder part :(.
> 
> I can imagine!   :-p
> 
> > We will have another meeting on
> > wednesday and this bug will likely (unless we run out of time) be on
> > the agenda/table again.
> 
> Thanks a lot, this is really appreciated.
> 
> > 
> > We see more IOMMU related failures recently (when old HW is involved),
> > so this might indeed be the way forward, tbh. But we will see tomorrow
> > is someone has other input on the topic.
> 
> OK, looking forward to receiving further feedback.
> 
> As always, thank you so much for your kind assistance!   :-)

I keep the answer short after we discussed it as promissed.

You can pass in as well other PCI devices for instance, say maybe pass
a USB controller in, or a NIC. But really if you never used that for
your usecase, our proposal is now to just keep IOMMU disabled (either
via BIOS setting, or via kernel command line parameter) and consider
this (even not solved in the most optimal way) "done".

Regards,
Salvatore

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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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