Your notebook plays MP3s and music CDs correctly and at full volume. But for videos and DVDs, the volume seems to be little lower than usual.
This unsatisfactory and frustrating situation is caused by a faulty AC3 driver implementation. The fact that the audio is even audible means that the AC3 driver is working somewhat, but apparently a setting for the downmix to stereo output on the notebook is not configured correctly.
What can help you is a small tool called AC3Filter (found at http://www.ac3filter.net/.) Usually, just installing it should do the trick, but if the sound is still not clearly audible after that, go to the sound settings in Control Panel and select the setting '2/O-stereo' and under 'Preset', select 'Loud'. After restarting your computer, the playback of AC3 DVD audio will work perfectly.
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