Re: USB xHCI regression after upgrading from kernel 3.19.0-51 to 4.2.0-34.

[Hans de Goede <hdegoede@redhat.com>]

Hi,

It is probably best to resend this mail to
linux-usb <linux-usb@vger.kernel.org>
since this is more of a usb problem then a v4l2 problem,
and all the usb experts are subscribed to that list.

Regards,

Hans



On 07-04-16 17:36, Matthew Giassa wrote:
> Good day,
>
> I maintain an SDK for USB2.0 and USB3.0 U3V machine vision cameras, and
> several of my customers have reported severe issues since upgrading from
> kernel 3.19.0-51 (Ubuntu 14.04.3 LTS) to kernel 4.2.0-34 (Ubuntu 14.04.4
> LTS). I've received helpful advice from members of the libusb and
> linux-usb mailing list and development groups on how to generate useful
> logs to help diagnose the issue, and have filed a bug to track this
> issue at:
>
>    https://bugzilla.kernel.org/show_bug.cgi?id=115961
>
> It seems that with kernels newer than the 3.19 series (I've tested on
> 4.2.0-34, and just repeated the tests on the latest 4.5.0 release), the
> cameras lock up, and cannot stream image data to the user application. I
> am able to resolve the issue on 4.2.0-34 by disabling USB power
> management by adding "usbcore.autosuspend=-1". On the 4.5 kernel, this
> "trick" doesn't work at all, and I have no way to get the cameras to
> stream data. I can do simple USB control requests to query things like
> register values and serial numbers, but that's it. Asynchronous bulk
> transfers never succeed.
>
> Special Cases:
>   * The issue does not occur when using USB2.0 cameras on a USB2.0 port,
> regardless of the kernel in use.
>   * The issues occur only on Intel 8 Series and Intel 9 Series USB3.0
> host controllers with 4.x kernels.
>   * Intel 10 Series host controllers have not yet been tested.
>   * The issues never occur on Fresco or Renesas host controllers,
> regardless of the kernel in use.
>   * From visual inspection of lsusb output, the issue only appears to
> happen when the U1 and U2 options are available to the device.
>
> I would like to request assistance with diagnosing and resolving the
> issue, as it requires our customers to either not use Intel host
> controllers, or sticking to older kernel releases.
>
> Thank you for your time and assistance.
>
> ============================================================
> Matthew Giassa, MASc, BASc, EIT
> Security and Embedded Systems Specialist
> linkedin: https://ca.linkedin.com/in/giassa
> e-mail:   matthew@giassa.net
> website:  www.giassa.net
>
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