[SATLUG] USB microphone issue

Igor Gueths igor.gueths at rackspace.com
Fri Nov 11 17:36:09 CST 2011


Hi Bruce,
I did some poking into that as well, and unfortunately, I don't think 
the patch below is even in 3.2; I checked 3.2-rc1, and no dice.
http://marc.info/?l=linux-usb&m=131973404328622
0

On 11/11/2011 5:32 PM, Bruce Dubbs wrote:
> Igor Gueths wrote:
>> Hi all,
>> I managed to get to the bottom of this issue after all; as it turned 
>> out, I was apparently on the right track as far as the EHCI frame 
>> scheduling issue. The main problem is that the bug, introduced around 
>> 2.6.39 or so (maybe a bit earlier), causes hub contention when a high 
>> speed and full speed USB device are plugged into the same hub; this 
>> actually applied to me, since I had completely forgotten my in-built 
>> webcam is on the same hub I was trying to use for the microphone.
>>
>> IN summary, plugging the microphone into one of the rear ports caused 
>> everything to work as expected, vs one of the side ones that I was 
>> previously trying to use. Just thought I'd briefly write about this 
>> in case someone else down the line runs into what I think is a fairly 
>> obscure issue.
>
> Wow, that is an obscure issue.  Good work in figuring it out.
>
> Do you know if the problem is fixed in later kernels?  Linux-3.1.1 was 
> just released.
>
>   -- Bruce
>
>


-- 
Igor



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