I assume you're using a laptop. I've noticed a similar issue on other laptops (Dell notebooks and Apple powerbooks have similar issues). It's simply because when the laptop is hooked up into a wall, the current that travels near the main motherboard in order to get to the charging battery causes interference. You may want to try using your laptop hooked up into external power but without the battery in the laptop itself and if the noise is then gone, then that is definitely what is causing it. Other option is that even if the battery is out and it still makes noise, that your external power connection is too close to the USB controller of some sorts (or even the USB connector) causing similar interference. Just a thought. Ico > -----Original Message----- > From: linux-audio-user-admin@xxxxxxxxxxxxxxxxxx [mailto:linux-audio-user- > admin@xxxxxxxxxxxxxxxxxx] On Behalf Of Frank Barknecht > Sent: Tuesday, February 18, 2003 12:49 PM > To: linux-audio-user@xxxxxxxxxxxxxxxxxx > Subject: [linux-audio-user] My Edirol UA-20 arrived, but now I have a big > problem! > > Hallo, > > my Edirol UA-20 USB audio device has arrived, and I also got it to > work: It was almost plug and play. But now I have a serious problem, > and that is noise when moving the mouse. I'm at loss what to do. > Everytime I move the pointer with mouse or touchpad on my Acer > Travelmade, the UA-20 produces nasty screetching, crackling and > scratching. This doesn't happen, when I unplug the power supply. The > UA-20 gets its power from the USB-port, so I suspect that this creates > the conflicts. > > Does anyone have an idea how to get rid of this noise? Or should I > send back the USB device? > > Thanks for any help... > > ciao > -- > Frank Barknecht _ ______footils.org__
