Comment 49 for bug 1801540

(In reply to Artem Hluvchynskyi from comment #10)
> (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 :)

Thank you for your feedback. I know that there is some work done around these audio chipsets in kernel-4.15 which should probably be backported to kernel-4.14. I will look to it closer when the kernel-4.15 will be released. Have fun ;)