latest upgrade completely breaks sound output, which worked perfectly before upgrade

[davidhodges.nz2]

I rebooted today for the first time in over a week and one of the updates Ubuntu installed during that time broke the sound, effective once I rebooted.
The sound still works fine if I reboot to *******. I've tried rebooting using older kernel versions - 4.2.0 and 4.4.57 - but neither helps. I still get no sound output at all under Linux.
The Ubuntu sound troubleshooting wiki page didn't tell me how to determine what sound card Linux thinks I have but cat /proc/asound/oss/devices
produces no output and grepping for sound or audio in dmesg output only turns up the following:

[ 7.115635] snd_hda_codec_realtek hdaudioC1D0: autoconfig for ALC3234: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker[ 7.115641] snd_hda_codec_realtek hdaudioC1D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)

[ 7.115644] snd_hda_codec_realtek hdaudioC1D0: hp_outs=1 (0x21/0x0/0x0/0x0/0x0)

[ 7.115647] snd_hda_codec_realtek hdaudioC1D0: mono: mono_out=0x0



I am running Ubuntu 16.0.4.1 LTS on a Dell Inspiron 17 5000 series.

Thanks for any help.

[howefield]

The Ubuntu sound troubleshooting wiki page didn't tell me how to determine what sound card Linux thinks I have

Just starting the same process with a troublesome laptop


sudo aplay -l

should give you the card.

[davidhodges.nz2]

Thanks for that.

**** 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 1: PCH [HDA Intel PCH], device 0: ALC3234 Analog [ALC3234 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0