Think Station S20 speaker noise by powering off

Hi,
my Thinkstation S20 (4157) always makes a noise (internal and/or external speakers) when I power it off,
it sounds a little bit like if you power off a guitar amp while the guitar is still plugged in.
I´m sorry for the bad  descreption.
The noise is only by powering off, not during restart, on win and linux.
Bios version is  1.39.
Do you have the same on your systems or is it somehow a failure on my S20?
Thanks for your answers!
Edit: Could this be a solution? http://en.wikipedia.org/wiki/Line_filter
Solved!
Go to Solution.

that one is new to me.   it could be tied somehow to power management in Ubuntu but i honestly don't know.
admittedly, i haven't used Linux for over a decade, back when you had to hack your own XF86Config files using hsync/vsync data direct from chipset manufacurer datasheets.   these days everything is point-and-click.   lol
anyway, you could try playing with various processor power management settings in the BIOS to see if that helps.
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

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