Hi John,

I see this issue in a Razer core X chroma, related to the Ethernet 
adapter. Obviously, this it is expansive to just buy for testing 
purposes. But just wanted to mention..

Best,

Lior

On Wed, May 6, 2020 at 15:44, John Jackson <email address hidden> 
wrote:
> Hi Ubuntu Community,
> 
> I would like to find one of the COTS products that is reproducing this
> issue. From reading the thread above it looks like it is a camera and 
> a
> usb ethernet adapter. Does anyone have more specifics or a product 
> link
> where I can purchase these. I currently havent seen the issue with a 
> Usb
> block device such as a JMicron nvme to usb device type c, but I will
> continue testing.
> 
> Where can i find this camera?
> Camera 1080p60 USB3 webcam
> idVendor=15aa, idProduct=1555
> 
> 
> Thanks,
> John
> 
> --
> You received this bug notification because you are subscribed to the 
> bug
> report.
> <https://bugs.launchpad.net/bugs/1749961>
> 
> Title:
>   xhci_hcd: TRB DMA errors reported with ASMedia ASM1142 USB 3.1
>   Controller
> 
> Status in linux package in Ubuntu:
>   In Progress
> Status in linux source package in Trusty:
>   Won't Fix
> Status in linux source package in Xenial:
>   In Progress
> Status in linux source package in Bionic:
>   In Progress
> Status in linux source package in Focal:
>   Confirmed
> Status in linux package in Debian:
>   Confirmed
> 
> Bug description:
>   It was observed that while trying to use a 4K USB webcam connected 
> to
>   USB port provided by ASMedia ASM1142 USB 3.1 Controller, the webcam
>   does not work and kernel log shows the following messages:
> 
>   [431.928016] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA 
> ptr not part of current TD ep_index 2 comp_code 13
>   [431.928021] xhci_hcd 0000:12:00.0: Looking for event-dma 
> 0000003f3330e020 trb-start 0000003f3330e000 trb-end 0000003f3330e000 
> seg-start 0000003f3330e000 seg-end 0000003f3330eff0
>   [431.928024] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA 
> ptr not part of current TD ep_index 2 comp_code 13
>   [431.928026] xhci_hcd 0000:12:00.0: Looking for event-dma 
> 0000003f3330e030 trb-start 0000003f3330e000 trb-end 0000003f3330e000 
> seg-start 0000003f3330e000 seg-end 0000003f3330eff0
>   [431.928027] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA 
> ptr not part of current TD ep_index 2 comp_code 13
>   [431.928029] xhci_hcd 0000:12:00.0: Looking for event-dma 
> 0000003f3330e050 trb-start 0000003f3330e000 trb-end 0000003f3330e000 
> seg-start 0000003f3330e000 seg-end 0000003f3330eff0
>   [431.928386] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA 
> ptr not part of current TD ep_index 2 comp_code 13
> 
>   A similar issue was already reported on Launchpad:
>   <https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667750>
> 
>   The fix to this issue seems to be the following patch:
>   
> <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9da5a109>
> 
>   Tests in our scenario with this patch proved still broken. Our next
>   approach is to modify the patch a bit and re-test.
> 
>   This LP will be used to document our progress in the investigation.
> 
> To manage notifications about this bug go to:
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