XHCI_TRUST_TX_LENGTH quirk?

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Sorry if this is answered somewhere, but I couldn't find anything
specific on Google as far as how to determine if this quirk is needed
or if its configurable at boot/run-time.   Its an HP laptop, and it
looks like other HP models have the problem.

I most often get this when turning on a USB TV Tuner, which is also HP
branded but shows up as a Hauppage device.   I get glitches on the TV
output, less with tvtime than other viewers, and these glitches go
away if I transcode a DVD while watching TV .. yeah, I know that makes
no sense.  Not sure if the glitches are related to the dmesg warnings.

I'll attach the lspci to the message in case anyone needs it.  Please
advise on the next step to proceed.

I'm running a Ubuntu kernel, but I imagine a stock kernel would react
the same.  uname -a ...
Linux Taro 3.13.0-32-lowlatency #57-Ubuntu SMP PREEMPT Tue Jul 15
04:08:59 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

dmesg output .... (all the repeats deleted) ...
[270905.416782] xhci_hcd 0000:00:10.0: WARN Successful completion on
short TX: needs XHCI_TRUST_TX_LENGTH quirk?
[270905.432813] xhci_hcd 0000:00:10.0: WARN Successful completion on
short TX: needs XHCI_TRUST_TX_LENGTH quirk?
[270907.943397] retire_capture_urb: 34 callbacks suppressed
[270910.103357] handle_tx_event: 90 callbacks suppressed
[270910.103372] xhci_hcd 0000:00:10.0: WARN Successful completion on
short TX: needs XHCI_TRUST_TX_LENGTH quirk?
[270910.153968] xhci_hcd 0000:00:10.0: WARN Successful completion on
short TX: needs XHCI_TRUST_TX_LENGTH quirk?

Attachment: lspci_-vvvv.txt.gz
Description: GNU Zip compressed data

Attachment: lspci_-vvvvn.txt.gz
Description: GNU Zip compressed data


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