Re: No sound cards detected on Kabylake laptops after upgrade to kernel 5.8

[Jaroslav Kysela]

Dne 11. 03. 21 v 6:50 Chris Chiu napsal(a):
> On Tue, Mar 9, 2021 at 11:29 PM Cezary Rojewski
> <cezary.rojewski@xxxxxxxxx> wrote:
>>
>> On 2021-03-09 1:19 PM, Chris Chiu wrote:
>>> Hi Guys,
>>>      We have received reports that on some Kabylake laptops (Acer Swift
>>> SF314-54/55 and Lenovo Yoga C930...etc), all sound cards no longer be
>>> detected after upgrade to kernel later than 5.8. These laptops have
>>> one thing in common, all of them have Realtek audio codec and connect
>>> the internal microphone to DMIC of the Intel SST controller either
>>> [8086:9d71] or [8086:9dc8]. Please refer to
>>> https://bugzilla.kernel.org/show_bug.cgi?id=201251#c246 and
>>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1915117.
>>>
>>>      From the dmesg from kernel 5.8, the sound related parts only show
>>> as follows but the expected snd_hda_codec_realtek and the snd_soc_skl
>>> are not even loaded then.
>>> [ 13.357495] snd_hda_intel 0000:00:1f.3: DSP detected with PCI
>>> class/subclass/prog-if info 0x040100
>>> [ 13.357500] snd_hda_intel 0000:00:1f.3: Digital mics found on
>>> Skylake+ platform, using SST driver
>>>
>>>      Building the kernel with the CONFIG_SND_SOC_INTEL_KBL removed can
>>> load the snd_hda_codec_realtek successfully and the pulseaudio and
>>> alsa-utils can detect the sound cards again. The result of bisecting
>>> between kernel 5.4 and 5.8 also get similar result, reverting the
>>> commit "ALSA: hda: Allow SST driver on SKL and KBL platforms with
>>> DMIC" can fix the issue. I tried to generate the required firmware for
>>> snd_soc_skl but it did not help. Please refer to what I did in
>>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1915117/comments/14
>>> and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1915117/comments/18.
>>>
>>>      Since the skl_hda_dsp_generic-tplg.bin and dfw_sst.bin are not in
>>> the linux-firmware. The Intel SST support for Skylake family is not
>>> yet complete. Can we simply revert the "ALSA: hda: Allow SST driver on
>>> SKL and KBL platforms with DMIC" in the current stage and wait for SOF
>>> support for Skylake family? Or please suggest a better solution for
>>> this. Thanks
>>>
>>> Chris
>>>
>>
>> Hello Chris,
>>
>> Guide: "Linux: HDA+DMIC with skylake driver" [1] should help
>> understanding history behind the problem as well as fixing it.
>>
>> Upstream skylake driver - snd_soc_skl - is intended to support HDA DSP +
>> DMIC configuration via means of snd_soc_skl_hda_dsp machine board
>> driver. You _may_ switch to legacy HDAudio driver - snd_hda_intel -
>> losing DMIC support in the process. To remove any confusion - for
>> Skylake and Kabylake platforms, snd_soc_skl is your option.
>>
>> Now, due to above, I doubt any skylake-related topology has ever been
>> upstreamed to linux-firmware as a) most boards are I2S-based, these are
>> used by our clients which we support via separate channel b) hda
>> dsp+dmic support on linux for missing until early 2020.
>>
>> Topologies for most common skylake driver configurations:
>> - skl/kbl with i2s rt286
>> - apl/glk with i2s rt298
>> - <any> with hda dsp
>> can be found in alsa-topology-conf [2].
>>
>> Standard, official tool called 'alsatplg' is capable of compiling these
>> into binary form which, after being transferred to /lib/firmware/ may be
>> consumed by the driver during runtime.
>> I have no problem with providing precompiled binaries to linux-firmware,
>> if that's what community wants.
>>
>> Regards,
>> Czarek
>>
>>
> 
> I think the guild [1] is too complicated for normal users to fix the problem.
> Given it's not only the internal microphone being affected, it's no sound
> devices being created at all so no audio functions can work after kernel 5.8.
> 
> Is there any potential problem to built-in the "<any> with hda dsp" precompiled
> binary in linux-firmware?

How do you distribute the SOF firmware? I'm going to include those binary
topology files to the SOF firmware package for Fedora. Perhaps, you may follow
this.

					Jaroslav

> 
> Chris
> 
>> [1]: https://gist.github.com/crojewsk/4e6382bfb0dbfaaf60513174211f29cb
>> [2]: https://github.com/alsa-project/alsa-topology-conf/tree/master/topology


-- 
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.