NACK/Cmnt: [PATCH 0/1][SRU][J/L/U] Fail to output sound to external monitor which connects via docking station

[Stefan Bader]

On 07.03.23 06:41, Chris Chiu wrote:
> On Mon, Mar 6, 2023 at 6:48 PM Stefan Bader <stefan.bader at canonical.com> wrote:
>>
>> On 06.03.23 06:13, Chris Chiu wrote:
>>> BugLink: https://bugs.launchpad.net/bugs/2009024
>>>
>>> [Impact]
>>> No sound output from the external monitor which connect via some docking station. It only happens when user boot the system with docking station connected. Re-plug the docking station can fix this issue. Or plug the docking station later won't trigger this problem.
>>>
>>> [Fix]
>>> Turn on the CONFIG_SND_HDA_INTEL_HDMI_SILENT in kernel config. It will start sending an "audio keepalive" to the monitor as soon as it is connected.
>>>
>>> [Test]
>>> Connect the external monitor to the Atomic Type-C Dock (HD22Q) and boot the system with the dock connected. Play sound via HDMI/DP port and check if there's any audio output from the external monitor.
>>>
>>> [Where problems could occur]
>>> It sends the "audio keepalive"(silent stream) to the monitor when connected. Doesn't affect original workflow of the audio system.
>>>
>>> Chris Chiu (1):
>>>     UBUNTU: [Config] Enable CONFIG_SND_HDA_INTEL_HDMI_SILENT_STREAM
>>>
>>>    debian.master/config/annotations          | 2 +-
>>>    debian.master/config/config.common.ubuntu | 2 +-
>>>    2 files changed, 2 insertions(+), 2 deletions(-)
>>>
>>
>> What about Kinetic?
>>
>> - Stefan
>>
> Per discussion with Anthony, we think it may be less impactful for
> Kinetic users since we can only reproduce it on the Dell HD22Q dock at
> this moment. I can of course do SRU for Kinetic. Shall I file a v2 to
> add Kinetic?

But Kinetic is the parent of jammy:linux-hwe-5.19 (and 
lowlatency-hwe-5.19). And that will be the kernel used by fresh desktop 
installations. So I would ask you to re-submit the complete set. A 
reworked L/U change and the K/J change. So we won't run into the problem 
of missing changes in future HWE again.

-Stefan

> 
> Chris

-- 
- Stefan

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