Public bug reported:
[ Impact ]
* The MediaTek MT8391-EVK platform lacks ALSA UCM configuration files,
preventing proper audio device management through PulseAudio/PipeWire.
* Without UCM, users cannot use standard audio controls for device
switching, and jack detection for headphones/headset doesn't work.
* This adds UCM configuration files (backported from upstream v1.2.15.3)
that enable proper audio device enumeration, jack detection, and
automatic device switching for MT8391-EVK hardware.
[ Test Plan ]
* Hardware required: MediaTek MT8391-EVK (e.g., Genio 720 EVK)
* Verify UCM configuration loads:
1. Install updated alsa-ucm-conf package
2. Run: alsaucm listcards
3. Confirm MT8391-EVK is detected
* Verify PipeWire device enumeration:
1. Run: wpctl status
2. Confirm these devices appear:
- Sinks: "I2S output", "PCM output", "Earphone speaker + Lineout speaker"
- Sources: "I2S input", "PCM input", "Digital microphone",
"Analog microphone + Earphone microphone"
* Test audio playback:
1. Play audio through speakers
2. Plug in headphones and verify automatic switching
3. Verify audio plays through headphones
* Test audio recording:
1. Record from microphone and verify it works
* Regression test on non-MT8391 hardware:
1. Install on another system (PC/laptop)
2. Verify existing audio still works
3. Check no UCM errors in logs
[ Where problems could occur ]
* This only adds new UCM configuration files for MT8391-EVK. No existing
files are modified.
* Possible issues (impact limited to MT8391-EVK hardware only):
- Incorrect ALSA control names could prevent audio from working
- Jack detection might fail if control names don't match the kernel driver
- Speaker and headphones could play simultaneously if conflicts not handled
* On non-MT8391 hardware: No impact expected. UCM files are only loaded
when MT8391-EVK card is detected. This is purely additive configuration
data, not executable code.
* Minimal regression risk: Based on upstream commit in production since
Sep 2025, follows established MediaTek EVK patterns.
[ Other Info ]
* Upstream: Commit 0d40e081dce2371fd4d37c8f184fd5be4b144601
- PR: https://github.com/alsa-project/alsa-ucm-conf/pull/607
- Author: Zoran Zhan <[email protected]>
- Released: alsa-ucm-conf v1.2.15.3 (Sep 2025)
* Follows same pattern as mt8370-evk, mt8390-evk, mt8395-evk UCM configs
already in the package.
* Files added: 4 new UCM configuration files (185 lines total)
- ucm2/MediaTek/mt8391-evk/HiFi.conf
- ucm2/MediaTek/mt8391-evk/init.conf
- ucm2/MediaTek/mt8391-evk/mt8391-evk.conf
- ucm2/conf.d/mt8391-evk/mt8391-evk.conf (symlink)
* Target releases:
- Noble: 1.2.10-1ubuntu5.9 → 1.2.10-1ubuntu5.10
- Questing: 1.2.12-1ubuntu2.2 → 1.2.12-1ubuntu2.3
** Affects: alsa-ucm-conf (Ubuntu)
Importance: Undecided
Status: New
** Tags: genio mediatek noble patch questing
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2139651
Title:
[SRU] Add ALSA UCM support for MediaTek MT8391-EVK platform
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/alsa-ucm-conf/+bug/2139651/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
