I have both on my macbook, Leopard as well as Windows XP pro SP3. When using Boot Camp, My macbook uses RealTek driver for the sound card and i have seen that it is not able to generate enough sound from my laptop. I have many many users who all has such problem after installing Boot Camp on their macbook. Actually i have measured this issue on both the operating systems and found that the my headphone jack creates 1000mV power on Mac OS which was just 280mV on Windows OS.
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