Hey there, I’ve dealt with this exact quirky Realtek audio issue before—total headache when your sound goes dead quiet the second you plug in your laptop, right? Let’s walk through targeted fixes that go beyond just reinstalling drivers or the system:

• Check Realtek Audio Manager’s Hidden Power Settings
  Open the Realtek HD Audio Manager (you can find it in Control Panel, or right-click the speaker tray icon if it’s pinned there). Hunt for a section like Power Management or dive into Advanced Settings. Sometimes there’s a sneaky option that lowers audio volume when on AC power to save energy—untick any box that mentions reducing volume for AC mode. If you don’t spot it right away, check the speaker properties within the manager and look through the Enhancements or Advanced tabs for power-related tweaks.

• Tweak Windows Power Plan Audio Settings
  Press Win + X and select Power Options. Click Change plan settings → Change advanced power settings. Expand Multimedia Settings → Playback quality. Set both On battery and On AC power to High quality. Then, head to Device Manager → Sound, video and game controllers → right-click Realtek HD Audio → Properties → Power Management. Uncheck the box that says Allow the computer to turn off this device to save power.

• Roll Back to an Older, Stable Realtek Driver
  Newer driver versions often introduce weird power-handling bugs. In Device Manager, right-click Realtek HD Audio → Properties → Driver → Roll Back Driver if the option is available. If not, go to your laptop manufacturer’s official website (skip Realtek’s generic driver page—use the one tailored to your model) and download an older, well-reviewed driver. Uninstall the current driver first (make sure to tick Delete the driver software for this device), restart your laptop, then install the older version.

• Disable Realtek’s Audio Enhancements
  Right-click the speaker tray icon → Playback devices. Select your default speaker → Properties → Enhancements. Tick Disable all sound effects and click Apply. Sometimes Realtek’s fancy audio enhancements clash with power state changes, causing random volume drops.

• Check BIOS for Audio Power Saving Options
  Restart your laptop and press the BIOS key (usually F2, F10, or Del—check the splash screen for the prompt). Look for settings like AC Audio Power Saving or Audio Power Management. If you find any such option, disable it, save your changes, and boot back into Windows.

If none of these work, there might be a hardware-related power delivery quirk, but given you’ve already reinstalled the system and drivers, these driver and setting tweaks should resolve the AC power volume issue.

内容的提问来源于stack exchange，提问作者Achy97