Comment 48 for bug 1801540

(In reply to Frédéric Pierret from comment #5)
> Hi,
>
> I also had the same problem with my ASROCK X370 Gaming K4 (ALC1220):
>
> 1st case: Booting FIRST Linux: Sound with noise/crackling.
> 2nd case: Booting FIRST Windows and SECOND Linux: Sound is perfect.
>
> I suceed in solving the problem by comparing the Coeff values in both cases
> and assign the values of the second case in a script at boot time. How to:
>
> - Install alsa-tools.
> - In both cases, you have to: echo 1 >
> /sys/module/snd_hda_codec/parameters/dump_coefs
> - Then, in the first case, alsa-info --no-upload --output infos_bad
> - Then, in the second case, alsa-info --no-upload --output infos_good
> - Finally, you compare the coef values: diff infos_bad infos_good | grep
> Coeff
>
> For changing the value of each different Coeff, you need to proceed as
> follow: for example, changing Coeff 0x67 to value 0x3000
>
> hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x67
> hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF 0x3000
>
> You have to do this in the growing order of Coeff. Remark that hwC0D0 refers
> to your sound card. In case of HDMI output like me, my sound card if hwC1D0.
>
> Here is a quick script:
>
> ------------------------------------------------------------------------
> #!/bin/bash
>
> coeffs=($(echo 0x{16,43,44,5d,5e,63,67}))
> values=($(echo 0x{8020,3405,fa10,0606,0000,e430,3000}))
>
> for i in `seq 0 $(( ${#coeffs[@]} - 1 ))`
> do
> hda-verb /dev/snd/hwC1D0 0x20 SET_COEF_INDEX ${coeffs[$i]} && hda-verb
> /dev/snd/hwC1D0 0x20 SET_PROC_COEF ${values[$i]}
> done
> ------------------------------------------------------------------------
>
> Just change the coeffs to change in the array 'coeffs' and the new values in
> array 'values' and exec this script. A remark, while I do not shutdown the
> power supply, my audio chipset keeps the values. This is why you need to do
> the FIRST case (first...) and then the second. Then, you could test if it
> works only when you shutdown the power supply of your mobo and then booting
> into Linux directly.
>
> I'm preparing a patch for the kernel but for those who have the problem,
> could you post your coeff/values which need to be change please.
>
> Hope this helps.

Hi Frédéric,

I have exactly the same issue with my X370 Gaming K4 too, only with the output though, no sure about input as I don't have a non-USB mic to test. So far I've been working around it by rebooting to Windows 10 and back until finding this. Your script fixes it for me, thank you!

The coeffs are almost the same (which is no wonder with the same MB), except there's no difference in the last one (0x67) so I removed it from the script. Would be great to have it fixed on the driver level though.

So coeff arrays look like this for me:
coeffs=($(echo 0x{16,43,44,5d,5e,63}))
values=($(echo 0x{8020,3405,fa10,0606,0000,e430}))

Thanks again! Now I don't have to reboot to Windows just for this until there's a driver fix :)