Not all monitors connected on the dock display correctly when the system resumes from restart or suspend on AMD platform

[AceLan Kao]

[Impact]
Not all monitors display well after resume from restart/power off/suspend when connect one/two/three monitors on the dock.

[Fix]
AMD provides a series of patches which are included in 6.15-rc6 fixes the issue
65924ec69b292 drm/amd/display: Fix wrong handling for AUX_DEFER case
3924f45d4de72 drm/amd/display: Copy AUX read reply data whenever length > 0
396dc51b3b7ea drm/amd/display: Remove incorrect checking in dmub aux handler
bc70e11b550d3 drm/amd/display: Fix the checking condition in dmub aux handling
5a3846648c052 drm/amd/display: Shift DMUB AUX reply command if necessary

[Test]
1. Connect one/two/three monitors with dock to AMD platform
2. Let the system into restart/power off/suspend, all monitors should all display after resume from restart/power off/suspend

[Where problems could occur]
Hard to evaluate, but only one commit doesn't CC stable, so we eventually will include those patches.

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

This bug is awaiting verification that the linux-oem-6.11/6.11.0-1023.23 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-oem-6.11' to 'verification-done-noble-linux-oem-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-oem-6.11' to 'verification-failed-noble-linux-oem-6.11'.

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-6.11 - 6.11.0-1023.23

---------------
linux-oem-6.11 (6.11.0-1023.23) noble; urgency=medium

  * noble/linux-oem-6.11: 6.11.0-1023.23 -proposed tracker (LP: #2111230)

  * ACPICA: Add support for printing AML arguments when trace point enabled
    (LP: #2111220)
    - ACPICA: Add support for printing AML arguments when trace point enabled

  * When the speaker volume is adjusted above 80%, noise occurs from the
    speakers with cs42l43. (LP: #2110950)
    - ASoC: intel/sdw_utils: Add volume limit to cs42l43 speakers

  * Support Sony IMX471 camera sensor for Intel IPU7 platforms (LP: #2107320)
    - SAUCE: media: ipu-bridge: Support imx471 sensor
    - [Packaging] debian.oem/dkms-versions -- bump ipu6-drivers version

  * Mediatek MT7920 WLAN card does not respect Wireless Radio Control in BIOS
    (LP: #2109314)
    - wifi: mt76: mt7921: add rfkill_poll for hardware rfkill

  * The system with VMD enabled may encounter hang (LP: #2110178)
    - SAUCE: PCI: vmd: Fix use-after-free bug in resource name assignment

  * Fix divide by zero errors in DML2 (LP: #2106923)
    - drm/amd/display: Protect FPU in dml2_init()/dml21_init()
    - drm/amd/display: Protect FPU in dml2_validate()/dml21_validate()
    - drm/amd/display: Protect FPU in dml21_copy()

  * Not all monitors connected on the dock display correctly when the system
    resumes from restart or suspend on AMD platform (LP: #2110095)
    - drm/amd/display: use drm_warn instead of DRM_WARN
    - drm/amd/display: Shift DMUB AUX reply command if necessary
    - drm/amd/display: Fix the checking condition in dmub aux handling
    - drm/amd/display: Remove incorrect checking in dmub aux handler
    - drm/amd/display: Copy AUX read reply data whenever length > 0
    - drm/amd/display: Fix wrong handling for AUX_DEFER case

  * Support AMD Image Signal Processing (ISP) unit V4.0 (LP: #2110092)
    - Revert "UBUNTU: [Config] Enable AMD_ISP4"
    - Revert "UBUNTU: SAUCE: ispkernel 3.0 release"
    - drm/amdgpu: Add MFD support for ISP I2C bus
    - drm/amd/amdgpu: Add support for isp buffers
    - SAUCE: ispkernel: 4.0 release
    - SAUCE: fix amd-isp4 build failures
    - [Config] Enable AMD_ISP4

  * System will restart while resuming with SATA HDD or nvme installed with
    password set (LP: #2110090)
    - PCI: Explicitly put devices into D0 when initializing

  * Privacy LED may not be turned on on OEM Renegade platform with Intel IPU7
    camera (LP: #2106807)
    - [Packaging] debian.oem/dkms-versions -- bump vision-drivers version

  * Fix volume control no effect on HP EliteStudio AIO (LP: #2109539)
    - ALSA: hda: Apply volume control on speaker+lineout for HP EliteStudio AIO

  * Fix Mic Mute LED no function on HP G12 laptops with ACP7.0 platform
    (LP: #2108954)
    - ASoC: amd: acp: Remove redundant acp70 chip->name
    - ASoC: amd: acp: Implement acp_common_hw_ops support for acp platforms
    - ASoC: amd: acp: Refactor dmic-codec platform device creation

 -- Chia-Lin Kao (AceLan) <email address hidden> Mon, 19 May 2025 14:27:43 +0800

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

This bug is awaiting verification that the linux-oem-6.14/6.14.0-1005.5 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-oem-6.14' to 'verification-done-noble-linux-oem-6.14'. If the problem still exists, change the tag 'verification-needed-noble-linux-oem-6.14' to 'verification-failed-noble-linux-oem-6.14'.

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!