Comment # 2 on bug 1198004 from Alan Hughes

There is a second sound device associated with my graphics card; this device is
not being used (it is disabled in YaST).

Rollback to an older version of TW (with a 5.16.x kernel) failed to resolve the
problem, however a complete power down (with power isolation to ensure that
capacitors are discharged) *did* result in the sound functionality being
restored. It looks like the kernel reboot I performed after the last TW update
left the sound device in an inconsistent state which the kernel did not reset
when booted.

Based on this I guess you can close the bug report, at least until I can
isolate things more comprehensively.