Re: [LAU] USB on ThinkPad T520

From: Karsten Wiese <fzuuzf@email-addr-hidden>
Date: Sun May 13 2012 - 00:18:22 EEST

2012/5/12 Clemens Ladisch <clemens@email-addr-hidden>:
> 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.

Karsten
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Received on Sun May 13 04:15:02 2012

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