Bug#454797: linux-image-2.6.22-3-686: USB 2.0 hub can't handle more than one full speed device
 

Package: linux-image-2.6.22-3-686
Version: 2.6.22-6

USB devices connected to external hub for USB 2.0 doesn't work
correctly if one of these devices utilises bandwith.

It is a problem for USB audio devices. If such device is working, no
more devices can work, i.e. another USB audio or camera. The dmesg
output is:

cannot submit datapipe for urb 1, error -28: not enough bandwidth

The solution is to use improved Transaction Translator scheduling
(CONFIG_USB_EHCI_TT_NEWSCHED).

I've tested CONFIG_USB_EHCI_TT_NEWSCHED with the latest Sid kernel and
it works correctly.

--
.'`. Piotr Roszatycki
: :' : mailto:Piotr.Roszatycki@gmail.com
`. `' mailto:dexter@debian.org
`-



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Bug#454797: linux-image-2.6.22-3-686: USB 2.0 hub can't handle more than one full speed device
 

On Fri, Dec 07, 2007 at 11:41:24PM +0100, Piotr Roszatycki wrote:
> USB devices connected to external hub for USB 2.0 doesn't work
> correctly if one of these devices utilises bandwith.
>
> It is a problem for USB audio devices. If such device is working, no
> more devices can work, i.e. another USB audio or camera. The dmesg
> output is:
>
> cannot submit datapipe for urb 1, error -28: not enough bandwidth
>
> The solution is to use improved Transaction Translator scheduling
> (CONFIG_USB_EHCI_TT_NEWSCHED).
>
> I've tested CONFIG_USB_EHCI_TT_NEWSCHED with the latest Sid kernel and
> it works correctly.

seen on fedora too.
set in trunk for upcoming 2.6.24
http://wiki.debian.org/DebianKernel

thanks for feedback.

--
maks



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