[LAU] USB on ThinkPad T520

[Robin Gareus]

On 05/13/2012 03:13 AM, plutek wrote:
> From: Karsten Wiese <fzuuzf at googlemail.com>
> Date: Sat, 12 May 2012 23:18:22 +0200
> 
>> 2012/5/12 Clemens Ladisch <clemens at ladisch.de>:
>>> 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/029511.html


> cheers!
> .pltk.