Here it is:
[    0.293604] iommu: Default domain type: Translated 
[    0.487357] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[    0.487484] pci 0000:00:01.0: Adding to iommu group 0
[    0.487493] pci 0000:00:01.1: Adding to iommu group 1
[    0.487500] pci 0000:00:01.2: Adding to iommu group 2
[    0.487511] pci 0000:00:02.0: Adding to iommu group 3
[    0.487518] pci 0000:00:02.1: Adding to iommu group 4
[    0.487526] pci 0000:00:02.2: Adding to iommu group 5
[    0.487538] pci 0000:00:08.0: Adding to iommu group 6
[    0.487544] pci 0000:00:08.1: Adding to iommu group 6
[    0.487550] pci 0000:00:08.2: Adding to iommu group 6
[    0.487560] pci 0000:00:14.0: Adding to iommu group 7
[    0.487566] pci 0000:00:14.3: Adding to iommu group 7
[    0.487587] pci 0000:00:18.0: Adding to iommu group 8
[    0.487593] pci 0000:00:18.1: Adding to iommu group 8
[    0.487599] pci 0000:00:18.2: Adding to iommu group 8
[    0.487606] pci 0000:00:18.3: Adding to iommu group 8
[    0.487612] pci 0000:00:18.4: Adding to iommu group 8
[    0.487618] pci 0000:00:18.5: Adding to iommu group 8
[    0.487624] pci 0000:00:18.6: Adding to iommu group 8
[    0.487629] pci 0000:00:18.7: Adding to iommu group 8
[    0.487640] pci 0000:01:00.0: Adding to iommu group 9
[    0.487648] pci 0000:01:00.1: Adding to iommu group 9
[    0.487656] pci 0000:02:00.0: Adding to iommu group 10
[    0.487664] pci 0000:03:00.0: Adding to iommu group 11
[    0.487671] pci 0000:04:00.0: Adding to iommu group 12
[    0.487685] pci 0000:05:00.0: Adding to iommu group 6
[    0.487688] pci 0000:05:00.2: Adding to iommu group 6
[    0.487693] pci 0000:05:00.3: Adding to iommu group 6
[    0.487696] pci 0000:05:00.4: Adding to iommu group 6
[    0.487700] pci 0000:05:00.6: Adding to iommu group 6
[    0.487703] pci 0000:06:00.0: Adding to iommu group 6
[    0.487707] pci 0000:06:00.1: Adding to iommu group 6
[    0.489073] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[    0.490935] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
[    0.535396] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <email address hidden>

Seems it is supported?

(In reply to Cameron Berkenpas from comment #312)
> Maybe try:
> 
> dmesg | grep -i iommu
> 
> On 6/25/2021 6:24 PM, Cameron Berkenpas wrote:
> > You're welcome. I understand the frustration!
> >
> > Can you or anyone else with a Legion 7 16ACHg6 check if your CPU has 
> > IOMMU support? I'm not able to find an answer to this one way or 
> > another. If so, likely the same trick can be used to find the codec 
> > initialization verb sequence.
> >
> >
> > On 6/25/21 5:06 PM, <email address hidden> wrote:
> >> https://bugzilla.kernel.org/show_bug.cgi?id=208555
> >>
> >> --- Comment #307 from Pablitar (<email address hidden>) ---
> >> And thank you so much for what you are doing Cameron!
> >>
> >> (In reply to Cameron Berkenpas from comment #305)
> >>> You're not the first person to report that these fixes don't work for
> >>> the 2021 Legion.
> >>>
> >>> Can you post your alsa-info?
> >>>
> >>> I'd like to order one as soon as they become available here in the USA,
> >>> but I'm unsure what the availability will be. If I managed to snag one,
> >>> I'll work on getting sound working there too.
> >>>
> >>> On 6/25/21 4:52 PM, <email address hidden> wrote:
> >>>> https://bugzilla.kernel.org/show_bug.cgi?id=208555
> >>>>
> >>>> Pablitar (<email address hidden>) changed:
> >>>>
> >>>>              What    |Removed                     |Added
> >>>>
> >>>
> >>>
> ---------------------------------------------------------------------------- 
> >>>
> >>>> CC|                            |<email address hidden>
> >>>>
> >>>> --- Comment #304 from Pablitar (<email address hidden>) ---
> >>>> Hey!
> >>>>
> >>>> I've tested some of these fixes on my Lenovo 16ACHg6 and had no luck.
> >>>>
> >>>> What I've tested:
> >>>> - Using the applyverbs.py with verbs-working.txt
> >>>> - Applying the legion-alc287-0.0.4.patch as per instructions
> >>>> - Applying the legion-alc287-0.0.5.patch as per instructions
> >>>>
> >>>> Something that may be important is that this new model is running 
> >>>> an AMD
> >>>> processor and the sound controller appears as:
> >>>>
> >>>> 'Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models
> >>> 10h-1fh)
> >>>> HD Audio Controller'
> >>>>
> >>>> On Alsa Mixer, it says the "Chip" is ALC287 but the "Card" is HD-Audio
> >>>> Generic.
> >>>>
> >>>> Is that important? I'm bringing this up because the instructions say:
> >>>>
> >>>> # Patch file to enable output on speakers.
> >>>> options snd-hda-intel patch=legion-alc287-0.0.4.patch
> >>>>
> >>>> And the intel part there may be something to change?
> >>>>
> >>>> But honestly I'm clueless so this may be waaay off.
> >>>>
> >>>> Thanks in advance!
> >>>>
> >