On 3/11/2021 11:24 AM, Jaroslav Kysela wrote:
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.
Wouldn't it make more sense to distribute binaries along with confs from
which they are build, which are already installed by alsa-topology package?
Similarly Ubuntu could use alsa-topology-conf package...
