https://marc.info/?l=openbsd-misc&m=149408763225691&w=2

On 05/09/17 23:09, G wrote:
> i had problems with xhci driver too.
> I get
> "xhci0: wrong trb index (-1956096) max is 255"
> 
> I dont know if its relevant.
> 
> On 05/09/17 13:18, Stefan Sperling wrote:
>> On Tue, May 09, 2017 at 11:00:26AM +0100, Caolan McMahon wrote:
>>> uaudio_chan_open: error creating pipe: err=INVAL endpt=0x01
>>
>> The problem is that xhci(4) does not yet support isochronous
>> transfers which are needed for USB audio devices to work.
>> http://www.beyondlogic.org/usbnutshell/usb4.shtml#Isochronous
>>
>> AFAIK this also affects other devices such as cameras.
>>
>> USB disks work because they use bulk transfers.
>>
> 

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