Messages in this thread | | | Subject | Re: No sound cards detected on Kabylake laptops after upgrade to kernel 5.8 | From | Cezary Rojewski <> | Date | Tue, 9 Mar 2021 16:29:13 +0100 |
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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
[1]: https://gist.github.com/crojewsk/4e6382bfb0dbfaaf60513174211f29cb [2]: https://github.com/alsa-project/alsa-topology-conf/tree/master/topology
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