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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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:
Incomplete
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.
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