Originally Posted by Mr. ameya sathe
FYI, I listen to songs on that PC.
Congratulations, you really are a certified engineer.
IMO; please take the pain of re-reading my original post word-by-word carefully.
Do you think that people who aren't certified engineers have unlimited free time?
1. That you listen to music proves nothing. The music player might use ALSA directly.
2. Pulseaudio might be in "standby" mode.
3. Pulseaudio is known to be buggy as hell. Didn't they tell you that in certification class? Download and compile the latest version. Hint:
sudo && make install
Alternatively, bind the key to a shell script that does something like "xkbbell".