ACK/cmnt: [SRU][Xenial][PATCH 0/2] alsa/hdmi: the hdmi audio stops working from Ubuntu-4.4.0-155.182

Hui Wang at
Tue Sep 15 10:40:56 UTC 2020

On 2020/9/15 下午6:03, Kleber Souza wrote:
> On 15.09.20 05:51, Hui Wang wrote:
>> BugLink:
>> [Impact]
>> We had a Dell machine, this machine was enabled with ubuntu 4.4
>> kernel before, but recently the hdmi audio on this machine stopped
>> working with the latest ubuntu 4.4. kernel. The system can't detect
>> its plugging and can't output sound to it anymore.
>> [Fix]
>> This is because we backported a patch from stable updates, and that
>> patch is for v5.2 kernel, if we backported it to 4.4 kernel, we need
>> to do some change, and also we need to backport one more patch from
>> stabe kernel.
>> [Test Case]
>> Connect a monitor to the machine and boot up, after booting up, we
>> could see the hdmi audio is found, and play sound to the hdmi audio,
>> we could hear the sound from monitor.
>> [Regression Risk]
>> It is possible to make the hdmi audio fail to work after applying this
>> patchset, like the hdmi audio can't be detected after plugging a hdmi
>> monitor. But this possibility is very low, we tested the patchset on
>> many dell and lenovo machines, all worked well.
>> Hui Wang (2):
>>    ALSA: hda/hdmi - Read the pin sense from register when repolling
>>    UBUNTU: SAUNCE: ALSA: hda/hdmi - Check pin_eld->monitor_present
>>   sound/pci/hda/patch_hdmi.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
> Hi Hui,
> Have you sent this fixup for the linux-stable 4.4.y?
OK, I will check linux-stable 4.4.y and send the patchset to it.
> There's a typo on patch 2/2, it should be "SAUCE". This can be
> fixed when applying.
> Acked-by: Kleber Sacilotto de Souza <kleber.souza at>
> Thanks.

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