Hello, my problem is the same one of this topic:
http://h30434.www3.hp.com/t5/Notebook-PC-Sound-and-Audio-e-g-Windows-8/Serious-bug-HP-Pavilion-dm4-3005-BIOS-drivers-ACPI-sys/td-p/1849011
But the problem is that I have a Pavilion dv7 and I've just updated the BIOS but the problem is still there..
As you see from the image
ACPI causes serious problem dealing with Audio.
Can anybody help me?