** Description changed: - this is for tracking purpose. + [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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1917829 Title: alsa/hda: the hdmi audio dosn't work on TGL machines To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1917829/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
