** No longer affects: linux (Ubuntu Focal) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1917829
Title: alsa/hda: the hdmi audio dosn't work on TGL machines Status in HWE Next: New Status in linux package in Ubuntu: In Progress Status in linux-oem-5.10 package in Ubuntu: Invalid Status in linux-oem-5.10 source package in Focal: In Progress Status in linux source package in Groovy: In Progress Status in linux source package in Hirsute: In Progress Bug description: [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. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1917829/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
