I can confirm, working sound on a Thinkpad T530 using snd-hda-intel kernel driver stopped working after upgrade from Kubuntu 18.04 to Kubuntu 18.10.
=> sudo apt purge timidity-daemon resolved the issue for me permanently.
Doing a sudo alsa force-reload also worked, but only until the next reboot.
I can confirm, working sound on a Thinkpad T530 using snd-hda-intel kernel driver stopped working after upgrade from Kubuntu 18.04 to Kubuntu 18.10.
=> sudo apt purge timidity-daemon resolved the issue for me permanently.
Doing a sudo alsa force-reload also worked, but only until the next reboot.