I've had the same problem with HP and Advent adapters. I have also had a whining develop from my laptop (a Dell) during part of the charging cycle. This is casued by the microscopic expansion and contraction of the components in the supply. There is no way to avoid it as far as I know.

 

So its just that Folks with sharp ears are cursed?

 

So its just that Folks with sharp ears are cursed?

As far as I know, yes.