When I restart my system it shows only one sink list through terminal but at the output section of sound it has two sink 1. HDMI and 2. Headphone . When I click on headphone then it showing two sinks in terminal. This problem occurs everytime when I restart my system.
Just out of curiosity: Are you indeed running SLE 12.4? According to Wikipedia general support was dropped in 2020 and long-term support was dropped in June 2023,
Or was it just a typo?