linuxaudio.org

Pieter Palmers wrote:
> Is the noise only present when printing, or also when the printer is

quoted text
> idle?

Noise is there whether the printer is turned on or not. It disappears

only when one or another of the cables are disconnected.
> What you can do to test whether it is a ground loop is interrupting

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> the ground connection of the power plug (e.g. by wrapping some

> non-conductive tape around the pin). If the noise stops, you have a

> ground loop. Don't use this as a solution to your ground loop however,

> as it is probably against regulations and is also pretty unsafe

> regarding electric shocks.

>

> If it is a ground loop, it is pretty difficult to solve. It's badly

> designed hardware. You could try to plug your printer into the same

> power outlet as the machine.

The printer is plugged into the same strip as the machine.
I tried lifting the ground, the noise was undiminished.
Next I'll try reprioritizing the interrupts, as soon as I can get

irqtune built. Or is there other software I should try ?
Linux 2.6 kernel, Debian Etch.
Best,
dp