APPLIED [OEM-5.10] Re: [SRU][H/G/OEM-5.10][PATCH 0/1] alsa/hda: the hdmi audio dosn't work on TGL machines

[Timo Aaltonen]

On 5.3.2021 8.06, Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1917829
> 
> [Impact]
> On the TGL machines, we plug a dp mst hub to the thunderbolt port,
> and plug a hdmi/dp monitor to the dp mst hub, then check the
> gnome-sound-setting, could not find the hdmi/dp audio device.
> 
> [Fix]
> backport a patch from upstream, this patch change to assign
> the pcm slot dynamically on TGL macines.
> 
> [Test]
> On 2 lenovo and dell TGL machines, plug dp mst hub and plug
> 2 monitors to the hub or to the machine hdmi/dp ports, check
> the gnome-sound-setting, there are 2 hdmi/dp audio devices.
> and they all could output sound.
> 
> 
> [Where problems could occur]
> After this change, the hdmi audio device number starts from 0, 1, ...,
> while without this change, the hdmi audio device number is fix
> mapped, it could be 3 or 5 directly. So if there is some userspace
> applications depends on the fix mapped hdmi audio device, these
> applicatons could not work on TGL machines.
> 
> So far, we don't know if those applications exists or not, but I
> could confirm the ubuntu audio stack builds on the alsa-lib and
> pulseaudio, this change will not affect the applications based
> on the alsa-lib and pulseaudio.
> 
> And I already tested audio functions under ubuntu on the TGL machines,
> there is no regression.
> 
> 
> Hui Wang (1):
>    ALSA: hda/hdmi: let new platforms assign the pcm slot dynamically
> 
>   sound/pci/hda/patch_hdmi.c | 18 +++++++++++++++++-
>   1 file changed, 17 insertions(+), 1 deletion(-)
> 

applied to oem-5.10, thanks


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