Hi, On 04/07/2011 12:34 AM, Dave Phillips wrote: > I've been working with Ardour3 on my laptop, a machine with an AMD > Turion X2 CPU and an nVidia 8200M integrated video chipset. Recently I > started monitoring my test recordings through the headphone output of my > UA25 and I notice that when I move the mouse it creates scratchy sounds, > though QJackCtl reports no xruns and my recordings are unaffected. I > verified the problem with Ardour2 and Mixbus. It doesn't occur when I > use the integrate audio chipset (snd-hda-intel, wahoo). we observed exactly the same problem (only on the output of a custom made USB sound card). The noise was spikes of varying amplitude at a fixed rate (125ms if I remember well). Replacing the USB cable by a shorter one significantly reduced the problem, and it also depended on the USB ports used for mouse and sound card. On some mainboards/laptops the noise was less then on others. See http://vegri.net/output_zero.png and http://vegri.net/output_inactive.png for output spectrum of the sound card (custom made, not UA25) when playing zeros and when not in use. - Giso > > Running 'cat /proc/interrupts' reports that usb1/usb3 share interrupt 17 > and usb2/usb4 share interrupt 16. I've tried switching ports around but > that didn't get rid of the noise. Any further suggestions ? > > Best, > > dp > > > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
