linuxaudio.org

From: Robin Gareus

Date: Sun, 13 May 2012 08:57:26 +0200
> On 05/13/2012 03:13 AM, plutek wrote:

quoted text
>> From: Karsten Wiese

>> Date: Sat, 12 May 2012 23:18:22 +0200

>>

>>> 2012/5/12 Clemens Ladisch :

>>>> plutek wrote:

>>>>> i've been running AVLinux5.0.3 on a ThinkPad T61p for a while now....

>>>>> with an ART USB Dual Tube Pre, i can run Jack at 64 frames, 2 periods

>>>>>

>>>>> now i've got a new ThinkPad T520, and if i start jack on USB at 64*2

>>>>> i get hundreds of xruns in seconds.

>>>>

>>>> Both machines run (I assume) the same software?  Then the problem is

>>>> with the hardware, or its drivers.

>>>>

>>>> Please show the output of lspci and the contents of /proc/interrupts.

>>>>

>>>

>>> Thinkwiki says its got a QM67. That does USB 1.1 via the "Rate

>>> matching hub" and EHCI.

>>> I guess linux's hub driver is the culprit.

>>

>> hmmmm.... shame.... lenovo specs said, of course, "USB 2.0".

>> mrph.

>>

>> any way around this currently?

>

> yes,

>

> http://lists.linuxaudio.org/pipermail/linux-audio-dev/2010-October/02951...

after i do:
# cd /sys/bus/pci/drivers/ehci_hcd/

# echo -n 0000:00:1d.0 > unbind
...the USB audio device no longer shows up in qjackctl.
did i misunderstand?
thanks... cheers!

.pltk.

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