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

[Chris Chiu]

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?

Chris