[LAU] USB on ThinkPad T520

Karsten Wiese fzuuzf at googlemail.com
Sat May 12 21:18:22 UTC 2012

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.


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