ASUS ProArt PX13 audio loss after suspend (Strix Halo, ACP70)

ASUS ProArt PX13 audio loss after suspend (Strix Halo, ACP70)

[Sven Vainküla]

Hello!

I am trying to fix audio loss after suspend-resume on the ASUS PX13
(HN7306EA) laptop. It has an AMD Strix Halo APU with RT721 codec and
TAS2783 amplifiers on SoundWire bus. When resuming the system locks up
for 5-10 s and the SoundWire bus appears dead with no audio playback
(with more lock-ups at some times when playback is attempted).

This problem is also reported by other users, so this doesn't appear to
be bad hardware on my end. Audio support for this laptop got merged in
7.0-rcX and this problem has been present ever since (currently on 7.0.1).

I discovered that setting "amd-sdw-power-mode" in ACPI SSDT9 from
power-off mode (2) to clock-stop mode (1) allows the audio to continue
functioning after suspend-resume cycles.

This might be due to bad ACPI tables that ASUS neglected to modify to
fit this configuration, or possibly a suspend bug in somewhere in the
driver code. Sadly I don't have access to documentation for the devices
to debug this further.

Are you able to provide any input on whether the power-off mode should
be functional for this ASUS hardware configuration?
If the ACPI tables are correct and the power-off mode should work then
do you have any ideas on how to debug further and solve this problem?

If I can provide any more information, logs or apply any patches then
please let me know. Thank you!

Best regards,
Sven Vainküla