Correction to mine:
Recently purchased Razer earbuds from Woot, which arrived today. Tried them out on my 1520 & I heard the noise. Seems to only happen if I use the earbuds. I tried 2 sets of headsets and couldn't reproduce the...
My 1520 finally arrived - YAY!
Will do a full review shortly...
Short snippet - it's a little bigger than my m1210 (basically my m1210 can fit inside the 1520)
Ran the Windows Experience Index - got a 4.6
Have you tried using XP drivers from another manufacturer that uses the same video card in their laptops? Here are some laptops that use the 8600M GT:
Asus G1S & G2S
Acer Aspire 5920G
Sony VAIO AR Series