Comment # 1 on bug 1226512 from Takashi Iwai

Do you see any kernel trace or such while hanging at shutdown?

Also, please check whether the issue is seen on the recent upstream kernel,
too.
You can install 6.9.x kernel-default from OBS Kernel:stable:Backport repo
  http://download.opensuse.org/repositories/Kernel:/stable:/Backport/standard/