I tried with iommu=off when I last looked at this and the problem
persisted.

On Tue, Jun 23, 2020, 12:25 AM Mikko Rantalainen <1749...@bugs.launchpad.net>
wrote:

> Could somebody that is seeing this problem try to boot with kernel flag
> "iommu=off". Some hardware that used to work with older kernels may be
> broken and fails to work with modern kernels which default to using
> IOMMU.
>
> Note that disabling IOMMU is a heavy handed workaround, not a proper
> fix. For more information about IOMMU, see https://heiko-sieger.info
> /iommu-groups-what-you-need-to-consider/
>
> --
> 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:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749961/+subscriptions
>

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749961/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to     : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to