Lenovo Y550P-4CWI is not available anymore, so I re-verified this issue on another laptop - Acer Aspire 7560G (Radeon HD 6620G+6650M). This time I tested with Kubuntu 18,10 daily image, instead of Kubuntu 17.10.
With Radeon driver digital output is disabled by default, so audio goes to internal audio adapter. Also when I enabled HDMI output manually in System Settings, it priority remain below internal audio adapter which is desired behaviour. Unfortunately, I can no longer verify if issue is present with nouveau, but let's hope it's fixed there too. For the time being, I close this report. ** Changed in: pulseaudio (Ubuntu) Status: Incomplete => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/606579 Title: Digital output has a higher priority than analog output To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/606579/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs