I recently installed Ubuntu 20.04 on my computer, to replace 18.04 on another partition. Both systems are still bootable, and they share a /home folder on another partition. For some reason, headphones plugged into the front of my computer do not show up in 20.04, although they work fine in 18.04. On 18.04 they don't show in pavucontrol or System Settings - Sound except when they are plugged in, but then they are selectable for output. In 20.04 they don't show up at all. If I run 'aplay -l' under either OS version I get: **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 1: ALC887-VD Digital [ALC887-VD Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: NVidia [HDA NVidia], device 7: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: NVidia [HDA NVidia], device 8: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: NVidia [HDA NVidia], device 9: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 3: Speaker [USB Speaker], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 The first of these items seems to be my headphones, because if I run 'aplay -D plughw:0,0 /usr/share/sounds/alsa/Front_Center.wav' under 18.04 the file plays through my headphones. But in 20.04 I just get an error message: aplay: main:830: audio open error: Device or resource busy Again, if I open Audacity and go to Edit-Preferences-Devices and select ALSA as Host (the only option, in fact), then in the Playback Device drop down list, all the devices shown by 'aplay -l' are listed except for the first - my headphones. I have run the latest version of alsa-info.sh under both versions of the OS, and I attach the outputs. I am new to the list, so I'm not sure whether attachments are accepted, but I can paste them into another email if necessary. David _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
