I was using Creative Sound Blaster X-Fi Titanium Sound Card when my PC was still alive, now I have HP 630 laptop, and Ubuntu says:
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
Subsystem: Hewlett-Packard Company Device 3672
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at 92600000 (64-bit, non-prefetchable) [size=16K]
Capabilities:  Power Management version 2
Capabilities:  MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities:  Express Root Complex Integrated Endpoint, MSI 00
Capabilities:  Virtual Channel
Capabilities:  Root Complex Link
Kernel driver in use: snd_hda_intel
Kernel modules: snd-hda-intel
On same laptop for Windows I am using Realtek High-Definition (HD) Audio Driver and It works fine, When I am using Ubuntu 12.4 I am receiving half loud sound nearly, Now might be configuration problem, but on my PC I noticed little difference between these two OS...
Do you know any solution?
P.S. I have compared performance of 50 hz sine wire sound, used this test http://www.eminent-tech.com/music/multimediatest.html, and difference was clearly noticeable, on Win I received much clear much better sound.