Comment 90 for bug 563156

While Googling around to solve this problem with my Lenovo x100e, I stumbled into some random links about high pitch noise from the computer.

I think the missing sound could relate to this issue. In Windows I hear the high pitch regulator noise and the battery life span is much higher. And I recollect hearing the same sound with some previous version of Ubuntu. Those Ubuntu versions felt like being more power conservative.