Wired apple keyboard.
Computer woke from sleep to the lock screen with password authentication prompt on screen. Computer repetitively making the DUN sound just like the space bar is being held down. Sound stops by using the keyboard.
The issue can be reproduced by restarting the computer. The sound is present once you reach the login screen. It stops once you log in. Only once did the sound persist after logging in.
Computer woke from sleep to the lock screen with password authentication prompt on screen. Computer repetitively making the DUN sound just like the space bar is being held down. Sound stops by using the keyboard.
The issue can be reproduced by restarting the computer. The sound is present once you reach the login screen. It stops once you log in. Only once did the sound persist after logging in.