Hi again,
I'm trying to figure out why my xHCI controller refuses me to run two very
similar video cards at the same time. I'm not sure if this is a bug or if I'm
just misunderstanding, so let me see if I understand this right:
The interface of each card has two relevant alternates, 2 and 4. Number 2 has
bInterval=1, bMaxBurst=11, Mult=2, which from what I can see should be
11*(2+1)*1024 byte / 125µs, or 2.16 Gbit/sec. Number 4 has bInterval=1,
bMaxBurst=8, Mult=1, which should be 8*(1+1)*1024 byte / 125 µs, or 1.04
Gbit/sec.
I can run one card in alternates 2 or 4, no problem. But if I put another
card in the other USB port (my Lenovo X240 has one on each side) and try to
activate that too, I get
[ 287.919173] usb 2-2: Not enough bandwidth for altsetting 4
I've tried on another machine and it works fine there, so my code should,
at least on the surface of it, be fine. I've verified that the error is
COMP_BW_ERR (not COMP_2ND_BW_ERR).
My xHCI controller is 8086:9c31 (I believe this is Intel). lsusb -v with both
devices plugged in is attached. I'm running 4.3-rc2. There are no external
USB hubs in the mix.
So this is my question: Why can I run one card at 2.16 Gbit/sec but not two
at 1.04 Gbit/sec each? (Shouldn't the USB3 bus be 5 Gbit/sec?) Is there any
way to debug these issues, or is the controller just deciding and unwilling
to give out any information? Is the information of the bandwidth domains/
bus instances available anywhere? Am I misunderstanding something
fundamentally?
Thanks!
/* Steinar */
--
Homepage: http://www.sesse.net/
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