Further debugging information: After the HDMI cable was disconnected, if the HDMI audio output option is still there, you could try to use "Test Sound" on it, it will disappear right away.
And if it's not detected with hot plug, the following command could make it available: (although nothing could be heard at all) aplay -D plug:hdmi tmp.wav Note that only "aplay -D plughw:0,7 tmp.wav" could make a sound (with audio output manually set to HDMI) Neither "aplay -D plughw:0,3 tmp.wav" nor "aplay -D plughw:0,8 tmp.wav" could work. ubuntu@201307-14037:~$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: PCH [HDA Intel PCH], device 0: ALC290 Analog [ALC290 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1383997 Title: [Dell Vostro 5470] No HDMI audio with 14.04 To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1383997/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
