[linux-audio-user] noise from USB printer
markknecht at gmail.com
Fri Jul 21 20:29:24 EDT 2006
Ground loop problem? As a test only, what happens if you unplug power
on the printer, or turn the printer off?
If it is a ground loop issue - I did hear of this recently with a USB
hard drive I think - then possibly it's a cable issue or maybe you
could stuck a USB hub in the middle to break the loop? (Just
On the off chance it's something more nefarious, what are the relative
IRQ priorities of the USB controller vs. the sound card? I Assume the
sound card's IRQ has a high realtime priority? If not, and it's lower
than USB, then possibly there is some strange interaction. I've never
run into anything like that with USB, but I have with other devices
like a mouse, etc.
Hope this helps. (not holding my breath!) ;-)
On 7/21/06, Dave Phillips <dlphillips at woh.rr.com> wrote:
> I hooked up my new HP 6540 printer today, it's a beauty, but it
> creates a terrible noise through my speakers when it's running. Is this
> a known problem with USB devices ? Is it a mobo problem ? (This is
> happening on my old 800 MHz machine.)
> Short of disconnecting the cable when the printer isn't being used, is
> there a solution to this trouble ?
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