[LAU] No duplex mode with the EHCI driver and USB hub. Is the problem solved?

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To: linux-audio-user <linux-audio-user@...>
Date: Monday, November 7, 2011 - 9:53 pm


A few days ago in the alsa users mailing list, Clemens pointed to a
recent patch for the EHCI driver [1] [2] for solving the following problem:

The current TT scheduling doesn't allow to play and then record on a
full-speed device connected to a high speed hub.

In connection with this, there was a discussion here some months ago
[3]. Some users said that they were not able to get jack working in
duplex mode . I also tried to prepare my sister's notebook with a UA25EX
and duplex did not work either. I encountered the same problem in the
laptop of a friend of mine. In both cases, the computers have an Intel 5
Series/3400 Series Chipset USB2 controller. Jack always says "broken

I have not tried the patch yet but it seems to work if you read the
whole thread in alsa-users. Has someone else tried? Joan? Jeremy?

Regards, Pablo

[2] http://marc.info/?l=linux-usb&m=131973404328622

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[LAU] No duplex mode with the EHCI driver and USB hub. Is th..., Pablo Fernández, (Mon Nov 7, 9:53 pm)