The sound system has now taken on a new personality of its own. The internal speakers appear in the "Play sound through" list of Output pane of System Settings > Sound along with Headphones, built-in audio (even though there are no headphones connected. The Test Sound button works on both these items but produces the same test through the internal speakers.
The Rhythm Box Music player produces sound out of the built-in speakers as expected. Connection of a set of Bluetooth Headphones results in them being listed in the Play sound through list. The Test Sound button works through these headphones as does the output of the Rhythm Box Music Player. If a pair of wired headphones are plugged into the headphone socket, they are not deteted and the Test Sound button sends its test signal via the internal speakers. However, if the Bluetooth headphones are selected in the Play sound through list, the Test Sound button tests are directed through the Bluetooth headphones as one might expect. I am inclined to think that the original HDMI output was a red herring. I have, in the past, got sound to play through the speakers built-in to an HDMI monitor by connecting the monitor through the video output using an HDMI adapter. It seems that the sound output system is not very good at detecting which output devices are connected at any one time. This might be due to shortcomings in the kernel or for other reasons. Who knows? One thing that I can be sure of is that, after restarting the laptop, the sound system might well be in a new state and not necessarily in the one that it was in before restarting. There does not appear to be any consistent behaviour as yet. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1402194 Title: PCI/internal sound card not detected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1402194/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
