[LAU] real time audio and graphic/ interrupt tweaks?

[Martin Horn]

Hi again,

thanks for your answers!!

As the computer is a netbook it has only 2 usb ports both on bus 2 and this
shares the interrupt with the graphics (intel controller), is there a way to
alter these interrupt settings? What are the other 3 busses "lsusb" gives me
if I have only 2 physical ports both on bus 2?

Thanks again!
Martin

On Mon, Jul 27, 2009 at 9:48 AM, david <gnome at hawaii.rr.com> wrote:

> Arnold Krille wrote:
> > On Monday 27 July 2009 01:36:57 Martin Horn wrote:
> >> I try to run xwax on ubuntustudio 8.10 on a Panasonic CF-T2 subnotebook
> >> (1Ghz/512MB). Everytime I start real time audio apps like jack the
> graphic
> >> gets very slow and freezes for some seconds, also the audio playback is
> >> like timestretched and sounds filtered.
> >> I guess it has something to do with interrupts shared by graphic and
> sound
> >> (sound comes from a Maya44 USB sound card).
> >> Can anybody give me a hint how to check or alter interrupt settings or
> do
> >> you have any other ideas...?!
> >
> > Most computers have more then one usb port. And these usb ports sit on
> > different irq's, I doubt it that all of them are shared with the
> graphics.
>
> Well, if the OP has an Intel chipset - practically everything could be
> sharing an interrupt with the graphics. ;-)
>
> More important to know which internal HUB the laptop's USB ports are
> hooked to. My Toshiba laptop has 3 USB ports but only 2 USB internal
> hubs ...
>
> > How do you know which usb port uses which irq?
> > Check the output of "lsusb" and "cat /proc/interrupts" to see where you
> audio-
> > device is connected and which irq that port has.
>
> I had similar-sounding problems with my UCA202 USB sound card when I was
> running it as USB device #7 on a powered external 7-port USB2 hub.
> Problem went away when I hooked it directly to a port on the laptop.
>
> --
> David
> gnome at hawaii.rr.com
> authenticity, honesty, community
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> Linux-audio-user at lists.linuxaudio.org
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>
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