[BUG] hda/tas2781: ASUS ROG Xbox Ally X audio issues with default firmware

[Matthew Schwartz <matthew.schwartz@linux.dev>]

Hello,

I have an ASUS ROG Xbox Ally X which uses hda/tas2781 for the speaker amplifiers. I am splitting this out into a new thread based on the suggestion from [1] to fix the remaining issues with the device's audio separately. 

I built a kernel from tags/sound-6.19-rc1 in tiwai/sound and included [2], which seemed potentially relevant to the issue that I describe below.

By default, my system loads /usr/lib/firmware/ti/audio/tas2781/TAS2XXX13840.bin.zst. With this firmware file, any sound above the 70% volume limit range starts to become distorted and frequently drop out from either one or both speakers. I've included an alsa-info.sh report with this default firmware at [3].

If I run sudo mv /usr/lib/firmware/ti/audio/tas2781/TAS2XXX13841.bin.zst /usr/lib/firmware/ti/audio/tas2781/TAS2XXX13840.bin.zst and force the other firmware file for Xbox Ally models, my speakers work up to 100% without any of the drop outs I experience on the default firmware. I've included an alsa-info.sh report with this renamed firmware at [4].

I took an acpidump at [5] and extracted the dsdt table at [6]. Please let me know if there's any additional information I can provide from the device to further debug the sound issues with the default selected firmware.

Thanks,
Matt

[1]: https://lore.kernel.org/linux-sound/87zf8jesp0.wl-tiwai@suse.de/
[2]: https://lore.kernel.org/all/20251126141434.11110-1-baojun.xu@ti.com/
[3]: https://alsa-project.org/db/?f=840337cab11f6aa70cf48b15d55ac45e4027ff41
[4]: https://alsa-project.org/db/?f=6e482f72765d89520ea171f15641228bcadefcf0
[5]: https://gist.githubusercontent.com/matte-schwartz/d7ff3c857b45cca197f3d3adc16df0bc/raw/2e3267b8d1a9d619ecd8157e4da426be756b6497/acpidump.txt
[6]: https://gist.githubusercontent.com/matte-schwartz/4042dcd3779c3738af60536a9d4050d6/raw/5227717c6d40a2dc4012b95f7fefc6cd50ba784d/dsdt.dsl