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

[Chris Chiu]

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 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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2.25.1