Viral Mehta <viral.mehta@...> writes:
> SZÉKELYI Szabolcs wrote:
>
> > I have a USB 2.0 device (namely a Creative X-Fi Surround 5.1 sound card)
> > that's recognized as a 1.1 device thus running at only 12Mbps. The
> > trouble is that even stereo audio is crispy this way, running it at high
> > speed may solve it. I've seen messages in the kernel log like
> >
> I hope you are attaching your device to 2.0 port.
Indeed. Actually I'm attaching it to a 2.0 hub. I also have a USB stick and an
external storage attached to it, both running at high speed:
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=orion-ehci/1p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 2: Dev 3, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 3: Dev 10, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 4: Dev 11, If 0, Class=audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 11, If 1, Class=audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 11, If 2, Class=audio, Driver=snd-usb-audio, 12M
Since this thing (a SheevaPlug) has only one (2.0) USB port, and the OS is
running from a USB stick, I can't avoid using a hub.
> As long as I know, if device will work as high speed or full speed is
> decided at bus enumeration time.
> So, if you know using usbmon logs, that can help...
I did, but I don't understand a word of it... Here's it:
http://pastebin.com/m5348d4c
> > [ 117.410000] cannot submit datapipe for urb 0, error -28: not enough
> > bandwidth
> >
> Any other messages in dmesg ?
Nothing else apart from normal messages.
> what kernel? what distribution? This data equally matters along with logs.
It's a stock Debian kernel. uname -a says
Linux shiva 2.6.30-1-kirkwood #1 Tue Jun 16 10:59:11 UTC 2009 armv5tel GNU/Linux
Thanks,
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