I'm having the same issue. It seems we have the same laptop, based on what you attached. I think I have found some interesting details about this bug: 1) In my case, i'm dual booting with windows 10, the problem only occurs after booting into windows and then rebooting into ubuntu. A shutdown + start straight to ubuntu fixes the problem (I think this is why your sound came back). So, although this is a workaround, there is definitely something wrong. I describe the problem here in more detail https://askubuntu.com/q/1032543/172846 2) I think the problem is the windows Realtek drive putting the sound card in some kind of stand-by state that the linux driver cannot wake up from. Some people have reported with similar problems that downgrading the windows Realtek driver fixes the issue, but to me it is still clear that the problem is the linux driver not waking up correctly the device, not the windows driver using a feature intended to save power 3) With this idea that the problem is power-saving, I enabled the power-save feature in the linux driver: `echo 10 >/sys/module/snd_hda_intel/parameters/power_save` If I wait 10 seconds and then trigger a sound (i'm using a terminal's bell), the sound now works, it sounds weird at first (crackling) but it keeps improving after like 2 seconds where it sounds AFAICT normal, but then 2 seconds later the volume starts to decrease like when speakers are running out of battery until sound is completely gone again. So it seems the linux drivers are somewhat capable of waking up the sound card, but not permanently
** Attachment added: "alsa-info-not-working" https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1742852/+attachment/5138104/+files/alsa-info-not-working -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1742852 Title: [hostname, Realtek ALC294, Speaker, Internal] No sound at all after windows update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1742852/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
