26 Jul
2009
26 Jul
'09
9:36 p.m.
Hello LAU!
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...?!
Thanks in advance!
Martin
27 Jul
27 Jul
5:45 a.m.
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.
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.
Have fun,
Arnold
5:56 a.m.
Arnold Krille wrote:
On Monday 27 July 2009 01:36:57 Martin Horn wrote:
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 ...
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. 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(a)hawaii.rr.com
authenticity, honesty, community
12:51 p.m.
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(a)hawaii.rr.com> wrote:
Arnold Krille wrote:
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 ...
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 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(a)hawaii.rr.com
authenticity, honesty, community
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
28 Jul
28 Jul
7:18 a.m.
Unless there's an option to change interrupts in the netbook's BIOS, I
don't think there is. In most laptops, those kinds of interrupts are
hardwired.
I find usbview more useful for figuring out USB hierarchies, but maybe
it's just me being more visual. KInfoCenter is informative, too.
On my Toshiba, USBView shows that I have one EHCI host controller (USB2)
with a USB 2.0 hub (internal) hub that currently has 2 USB2 devices
attached to it - another USB 2.0 hub (external) and an external hard
drive (attached to a physical port on the laptop, not on the external hub).
It also shows that I have a UHCI host controller (USB 1.1) that
currently has my USB sound card attached to it.
That takes care of all three physical ports on this laptop.
KDEInfoCenter irqs report a UHCI controller with 3 busses using IRQs 16,
18 and 19; and a EHCI controller using IRQ 23.
So it looks like the USB2 controller is using 3 IRQs and the USB 1.1 is
using only one. So it looks like one IRQ per bus.
I'm just figuring this stuff out myself, so perhaps someone who really
knows stuff about USB can really explain what's going on?
Martin Horn wrote:
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(a)hawaii.rr.com
<mailto:gnome@hawaii.rr.com>> wrote:
Arnold Krille wrote:
sit on
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
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 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(a)hawaii.rr.com <mailto:gnome@hawaii.rr.com>
authenticity, honesty, community
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
<mailto:Linux-audio-user@lists.linuxaudio.org>
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
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days inactive
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days old
linux-audio-user@lists.linuxaudio.org
4 comments
3 participants
participants (3)
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Arnold Krille -
david -
Martin Horn