Public bug reported:
Constant (low volume) static hum, with increased loudness while moving
the mouse, typing, or text appearing in terminal.The problem occurs only
when the A/C power cable is plugged in. When running on battery power,
the problem completely disappears. If headphones are plugged in, it is
much more noticeable, however the static noise will come through both
the headphones and normal speakers. Its much more difficult to spot
without headphones, but still possible if the area around you is
relatively quiet. I have tested numerous linux live-cds, it seems the
problem is universal. I also tried it on the Fedora 8 live-cd, thinking
the new pulseaudio system might take care of it, but no luck. I have
not been able to test Windows to see if its a linux-only issue.
Laptop: Dell Inspiron E1505n (Ubuntu preinstalled)
Soundcard: 82801G (ICH7 Family) High Definition Audio Controller (STAC92xx)
** Affects: ubuntu
Importance: Undecided
Status: New
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Laptop static noise when A/C plugged in [Gutsy]
https://bugs.launchpad.net/bugs/162332
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