Bottom firing speakers of Dell Inspiron 16 Plus 7640 not working

[d3d9]

Only the two top speakers work, while two bottom speakers don't. Running on Fedora 41 x86_64 with kernel 6.11 at first and now 6.12. I was hoping 6.12 would make a difference since this quirk was included and it matches the ID 1028:0c94, but I couldn't notice a difference after switching to 6.12.

linux/sound/pci/hda/patch_realtek.c

Line 10222 in 89772eb

SND_PCI_QUIRK(0x1028, 0x0c94, "Dell Polaris 3 metal", ALC287_FIXUP_TAS2781_I2C),

I tried disabling sof as described here and I applied the dynamic debug example from here.

alsa-info: http://alsa-project.org/db/?f=ace89f27a762690123886260888182f29c03c428
alsa-info witout sof: http://alsa-project.org/db/?f=f3120373e78934bf886242e49f745128065a6349

[ujfalusi]

@d3d9, this is more of a question for Dell and Realtek (@bardliao, can you ping the relevant people?).
I'm not sure how the speakers should be working, but one thing caught my eye in the log:

[    9.382807] tas2781-hda i2c-TIAS2781:00: Direct firmware load for TAS2XXX0C94.bin failed with error -2
...
[   15.701712] tas2781-hda i2c-TIAS2781:00: tasdevice_prmg_load: Firmware is NULL

This might or might not be the reason, or some extra quirk is needed to get all speakers to work.

[ujfalusi]

Looks like this patch fixed the audio support (to get the top speakers to work):
2912cdd ("ALSA: patch_realtek: Fix Dell Inspiron Plus 16")

Which is interesting as before that patch only the bottom speakers worked.

[bardliao]

@KailangYang Can you take a look?

Codec: Realtek ALC3254
Address: 0
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x10ec0295
Subsystem Id: 0x10280c94
Revision Id: 0x100002

[KailangYang]

Please test attach patch.
But firmware load fail need to contact with Ti.
Firmware load fail maybe cause to add attach patch which bottom speaker also no sound.

0000-dell-0x0c94.patch

[d3d9]

@KailangYang Thank you. Something has changed, but there is no sound from bottom speakers.

alsa-info patched: http://alsa-project.org/db/?f=f0a69fb26a4781019dc7adbaeb4cef97a0b88c24
unpatched for comparison: http://alsa-project.org/db/?f=1eb46fddceca5f54e176154e63042d737660cd8c

unpatched:

patched:

[KailangYang]

[ 9.468295] tas2781-hda i2c-TIAS2781:00: Direct firmware load for TAS2XXX0C94.bin failed with error -2

This issue was need supported by Ti guy.