[Bug 2064689] Re: Fix inaudible HDMI/DP audio on USB-C MST dock

I can confirm Austin report also in a Lenovo Thunderbolt 4 Gen 2 USB-C
dock. Had to fall back to 6.5.0-1023.24_oem to get my external monitors
to work.

Also reported bug that is now a duplicate of Austin's

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https://bugs.launchpad.net/bugs/2064689

Title:
Fix inaudible HDMI/DP audio on USB-C MST dock

Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.5 source package in Jammy:
Fix Released
Status in linux source package in Mantic:
Won't Fix
Status in linux-oem-6.5 source package in Mantic:
Invalid
Status in linux source package in Noble:
Fix Committed
Status in linux-oem-6.5 source package in Noble:
Invalid

Bug description:
[Impact]
HDMI/DP audio isn't working on Dell's USB-C dock.

[Fix]
Leave Maud/Naud as is, since the hardware programmed the right value
already.

[Test]
HDMI/DP audio always comes out from the USB-C dock after the fix is
applied.

[Where problems could occur]
The commits affects _all_ HDMI/DP audio that connects to Intel GFX. So
all of them are affected hence the regression risk isn't low.

Therefore let the commit sits in OEM kernel first. Stable kernels can
pull in this fix after it's getting thoroughly tested.

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