X200: hiss when headphones are plugged to the Ultrabase

Hi,
I don't have a hiss if I plug the headphones in the X200 audio out jack, but have one the the Ultrabase audio out plug. I found it's somehow linked to CPU activity: it only happens when the CPU is at full speed, i.e. if I choose a power scheme that has a dynamic usage of the CPU, I don't hear the hiss, until the CPU needs more power.
Does this happen to others? Is it how the Ultrabase is designed? I find it's a bit of an expensive piece of hardware. I was already surprised it does not come with a dedicated power adaptor, now, I'd like it as a dock, even for audio.. Hope someone can point to any driver download or whatever would help this..
Kind regards,
amo

Hi amo and svott,
I'm having the same problem here on my X200 with Ultrabase under Windows 7 as well as under Ubuntu 10.04 Lucid Lynx. On Windows 7 I had to install the official audio drivers in order to get sound work via Ultrabase. When I use the Thinkpads Audio Out the problem is gone. However I didn't buy the Ultrabase to have cables attached to the Thinkpad directly.
I wonder if it is a problem that rare that it is being ignored? I found one more thread in a different forum that also has been closed by now. They also could link the hiss with the CPU load.

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