HiFi 7.1 Not Working

[leyvi]

Hello Gentoo community.
I just got some HiFi 7.1 compatible wired headphones, and it would seem that they are only partially working: going into KDE audio settings and changing it to work with HiFi 2.0 works perfectly fine. On 7.1, only front-right and front-left work. The headphones came with a USB adapter, which includes a controller, DAC etc, but when I try to use it, it doesn't work. I imagine that there's a kernel option that I need to enable, but I really don't know, I've never really messed around with audio before.
Here's my kernel config by the way: http://0x0.st/8oH1.txt
This is `dmesg`: http://0x0.st/8oHj.txt
I looked it over, and I think this is interesting:

[pietinger]

Hmmm ... the default value here is 32 ... why you have changed it to 4 ?

[leyvi]

OK, I'll give it a shot. Here's the output of `cpuid | grep x2APIC`:

[leyvi]

OK, here's how it went:
Headphones are now picked up by the OS when plugged in with USB (before it was just with the 3.5mm). I get several options: Analog Stereo Output, Digital Stereo Output (IEC958), and Digital Surround HiFi 5.1 (IEC958/AC3) Output. Analog sound good, Digital is basically the same as Analog, but where is HiFi 7.1? And why is it that when I set the headphones to use HiFi 5.1, and try to test it, my ears are violently raped?

[pietinger]

I cannot answer your questions. What says "aplay -L" (and "aplay -l") and "alsactl info" ? Does "lsusb -v" tell us something? Something in your "dmesg"?
_________________
https://wiki.gentoo.org/wiki/User:Pietinger

[leyvi]

aplay -L.
aplay -l.
This is the USB DAC/sound card that came with the headphones: lsusb --verbose -s 001:007.
This is my motherboard's audio port: lsusb --verbose -s 005:006.
Here's some stuff I sifted out of `dmesg`:

[pietinger]

Hmmm ... looks good:

[leyvi]

Unfortunately, `CONFIG_USB_DYNAMIC_MINORS=y` did not do the trick. Here's the new config. Note that I made some other small changes that I thought might fix the problem.