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

[Kai-Heng Feng]

[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.

[AceLan Kao (acelankao)]

This fix is required for the 6.5 and 6.8 kernels.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-oem-6.5/6.5.0-1024.25 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-oem-6.5' to 'verification-done-jammy-linux-oem-6.5'. If the problem still exists, change the tag 'verification-needed-jammy-linux-oem-6.5' to 'verification-failed-jammy-linux-oem-6.5'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Timo Aaltonen (tjaalton)]

please send this for noble kernel as it's required for transitioning oem-6.5 -> hwe-6.8

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/6.8.0-38.38 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux' to 'verification-done-noble-linux'. If the problem still exists, change the tag 'verification-needed-noble-linux' to 'verification-failed-noble-linux'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-6.5 - 6.5.0-1024.25

---------------
linux-oem-6.5 (6.5.0-1024.25) jammy; urgency=medium

  * jammy/linux-oem-6.5: 6.5.0-1024.25 -proposed tracker (LP: #2063708)

  * Fix inaudible HDMI/DP audio on USB-C MST dock (LP: #2064689)
    - SAUCE: drm/i915/audio: Fix audio time stamp programming for DP

  [ Ubuntu: 6.5.0-40.40 ]

  * mantic/linux: 6.5.0-40.40 -proposed tracker (LP: #2063709)
  * [Mantic] Compile broken on armhf (cc1 out of memory) (LP: #2060446)
    - Revert "minmax: relax check to allow comparison between unsigned arguments
      and signed constants"
    - Revert "minmax: allow comparisons of 'int' against 'unsigned char/short'"
    - Revert "minmax: allow min()/max()/clamp() if the arguments have the same
      signedness."
    - Revert "minmax: add umin(a, b) and umax(a, b)"
  * Drop fips-checks script from trees (LP: #2055083)
    - [Packaging] Remove fips-checks script
  * alsa/realtek: adjust max output valume for headphone on 2 LG machines
    (LP: #2058573)
    - ALSA: hda/realtek: fix the hp playback volume issue for LG machines
  * Mantic update: upstream stable patchset 2024-03-27 (LP: #2059284)
    - asm-generic: make sparse happy with odd-sized put_unaligned_*()
    - powerpc/mm: Fix null-pointer dereference in pgtable_cache_add
    - arm64: irq: set the correct node for VMAP stack
    - drivers/perf: pmuv3: don't expose SW_INCR event in sysfs
    - powerpc: Fix build error due to is_valid_bugaddr()
    - powerpc/mm: Fix build failures due to arch_reserved_kernel_pages()
    - powerpc/64s: Fix CONFIG_NUMA=n build due to create_section_mapping()
    - x86/boot: Ignore NMIs during very early boot
    - powerpc: pmd_move_must_withdraw() is only needed for
      CONFIG_TRANSPARENT_HUGEPAGE
    - powerpc/lib: Validate size for vector operations
    - x86/mce: Mark fatal MCE's page as poison to avoid panic in the kdump kernel
    - perf/core: Fix narrow startup race when creating the perf nr_addr_filters
      sysfs file
    - debugobjects: Stop accessing objects after releasing hash bucket lock
    - regulator: core: Only increment use_count when enable_count changes
    - audit: Send netlink ACK before setting connection in auditd_set
    - ACPI: video: Add quirk for the Colorful X15 AT 23 Laptop
    - PNP: ACPI: fix fortify warning
    - ACPI: extlog: fix NULL pointer dereference check
    - ACPI: NUMA: Fix the logic of getting the fake_pxm value
    - PM / devfreq: Synchronize devfreq_monitor_[start/stop]
    - ACPI: APEI: set memory failure flags as MF_ACTION_REQUIRED on synchronous
      events
    - FS:JFS:UBSAN:array-index-out-of-bounds in dbAdjTree
    - jfs: fix array-index-out-of-bounds in dbAdjTree
    - pstore/ram: Fix crash when setting number of cpus to an odd number
    - crypto: octeontx2 - Fix cptvf driver cleanup
    - erofs: fix ztailpacking for subpage compressed blocks
    - crypto: stm32/crc32 - fix parsing list of devices
    - afs: fix the usage of read_seqbegin_or_lock() in afs_lookup_volume_rcu()
    - afs: fix the usage of read_seqbegin_or_lock() in afs_find_server*()
    - rxrpc_find_service_conn_rcu: fix the usage of read_seqbegin_or_lock()
    - jfs: ...

[Austin Esquirell (ajesquirell)]

Updating to 6.5.0-1024.25_oem from 6.5.0-1023.24_oem breaks HDMI video on the Lenovo Thunderbolt 3 Gen 2 USB-C dock. Since this is the only bugfix relating to HDMI/USB-C docks it would seem that this is the change that causes the issue.

If there are any logs or additional details I can provide, I am happy to help.

[Kai-Heng Feng (kaihengfeng)]

Austin,

Can you please file a separate bug? Thanks!

[Leopoldo Pena (leopenausa)]

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