I am unable to hear sound from applications running on laptop. For example, I am getting no sound from Youtube videos regardless of whether I view them in Firefox or Chromium. I observed this when the machine awoke from a lid-down sleep this morning.
I am running Ubuntu 18.04 LTS on a machine built by Zareason. I have no external speakers.
I have worked through the diagnostics provided at https://help.ubuntu.com/stable/ubuntu-help/sound-nosound.html.en, without success.
On Activities/Settings/Sound, I have "Speakers - Built-in Audio". The Output Volume is set to maximum. The profile is set to "Analog Stereo Output" and is equally balanced between Left and Right. Clicking on "Test Speakers", both Front Left and Front Right test properly.
On the keyboard, Fn+RightArrow emits a beep when pressed. So I'm not muting from the keyboard.
$ lspci -v | grep -i audio 00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06) Subsystem: Micro-Star International Co., Ltd. [MSI] Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05) Subsystem: Micro-Star International Co., Ltd. [MSI] 8 Series/C220 Series Chipset High Definition Audio Controller
I have rebooted the computer, with no impact on sound.
I have performed 'sudo apt-get dist-upgrade', with no impact on sound.
I have also performed the steps described at https://www.unixmen.com/2012wget http://www.alsa-project.org/alsa-info.sh && bash ./alsa-info.sh --upload;003-howto-resolve-nosound-problem-on-ubuntu/, with no impact on sound.
sudo apt-get remove --purge alsa-base pulseaudio sudo apt-get install alsa-base pulseaudio sudo alsa force-reload
At the terminal I typed 'alsamixer'. I have "Card: HDA Intel HDMI"; Chip: Intel Haswell HDMI; View: Playback; Item S/PDIF. I have a row of 5 icons in which "S/PDIF" is selected. It has a little box above it with setting "00", which I have not yet been able to adjust (e.g., via the UpArrow, Shift-+ or PageUp keys.