** Description changed:
This issue was introduced by #1872916 ("Support Intel Soundwire
in 5.6-OEM Kernel 20.04"), so focal and groovy kernels don't need
this fix.
[Impact]
We found the sof driver instead of hda driver is enabled on a dell
machine without soundwire and dmic. This will make gnome show dummy
output and users have no audio device to use.
[Fix]
When we integrated fix for #1872916, we backported 2 patches, these
2 patches enable the sof driver unconditionally for Dell comet lake
machines. There is an upstream patch to fix it, let the sof driver
enable conditionally on comet lake machines.
[Test Case]
Boot the kernel with this patch on that dell machine, check the
gnome-control-center, all audio devices exist, playback and recording
work well.
[Regression Risk]
- On the Dell comet lake machines with dmic, the sof driver should
- enable. Without this patch, the sof driver will enable unconditionally,
- but with this patch, the sof driver will enable conditionally, so it
- is possible to introduce a regression that on Dell comet machines,
- the sof driver doesn't enable even the machine has dmic.
+ On Dell Comet Lake machines with DMIC, the sof driver should be
+ enabled. Without this patch, the sof driver will be enabled unconditionally,
but with this patch, the sof driver will be enabled conditionally, so it is
possible to introduce a regression that on Dell Comet Lake machines, the sof
driver is not enabled even the machine has DMIC.
- I have tested this patch on a Dell comet lake dmic machines, it worked
+ I have tested this patch on a Dell Comet Lake dmic machines, it worked
well.
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https://bugs.launchpad.net/bugs/1890231
Title:
alsa: should not load sof driver if the internal mic connects to the
codec
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