Do you have any other devices you can listen through, other than the computer’s internal speakers? That is, a wired or Bluetooth headphone set, or external speakers, also either wired or not? If you can get “normal” sound through the other devices, and the volume there responds properly to the software controls on the desktop, then that might indicate a problem with the computer’s internal speakers. If the sound is unreasonably low in all devices, then I’d be looking at a driver update or replacement, for starters.