Re: [linux-audio-user] noise from USB printer

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To: A list for linux audio users <linux-audio-user@...>
Date: Saturday, July 22, 2006 - 12:29 am

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
guessing!) ;-)

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!) ;-)

Cheers,
Mark

On 7/21/06, Dave Phillips wrote:

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Messages in current thread:
[linux-audio-user] noise from USB printer, Dave Phillips, (Fri Jul 21, 10:46 pm)
Re: [linux-audio-user] noise from USB printer, Mark Knecht, (Sat Jul 22, 12:29 am)
Re: [linux-audio-user] noise from USB printer, Dave Phillips, (Sat Jul 22, 11:14 am)
Re: [linux-audio-user] noise from USB printer, Lee Revell, (Sat Jul 22, 4:17 pm)
Re: [linux-audio-user] noise from USB printer, Dave Phillips, (Sat Jul 22, 4:26 pm)
Re: [linux-audio-user] noise from USB printer, Dave Phillips, (Sat Jul 22, 6:19 pm)
Re: [linux-audio-user] noise from USB printer, Dave Phillips, (Sat Jul 22, 6:55 pm)
Re: [linux-audio-user] noise from USB printer, Mark Knecht, (Sat Jul 22, 7:04 pm)
Re: [linux-audio-user] noise from USB printer, Pieter Palmers, (Sat Jul 22, 12:11 pm)
Re: [linux-audio-user] noise from USB printer, Dave Phillips, (Sat Jul 22, 1:12 pm)
Re: [linux-audio-user] noise from USB printer, Fons Adriaensen, (Sat Jul 22, 1:23 pm)
Re: [linux-audio-user] noise from USB printer, Dave Phillips, (Sat Jul 22, 1:43 pm)
[linux-audio-user] OT: Gear for auction, Aaron J. Trumm, (Fri Jul 21, 11:26 pm)