Did the dual cable also solve the OPs problem?
I have a similar issue, and perhaps a similar machine to the OP: It is a circa 2008 box with the intel ICH9 chipset, to which I have added a PCIe 1X card with the "NEC" USB 3.0 chip on it. In fact, I have tried 2 of these now from different mfgrs. Both have a 4-pin molex power connector which I am using (presumably solving the power issue as well as the dual cable?). I am unable to get a SuperSpeed connection to a Kingston DT Ultimate USB 3.0 flash stick. I always get a "high-speed" connection and the driver is always xhci_hcd: From syslog:
Code:
Jun 14 14:37:45 kennebec kernel: [ 167.568015] usb 9-2: new high-speed USB device number 2 using xhci_hcd
Running Ubuntu 12.04 amd64, kernel 3.2.0-25-generic. Mobo is ASUS P5E WS with 2 PCIe 2.0 slots (x16) and 1 x1 slot that *may* only be PCIe 1.1. I have tried to use both an x16 slot and the x1 slot with the identical outcome.
I have tried the latest 3.4 mainline kernel also (3.4.0-030400-generic_3.4.0-030400.201205210521_amd64) - same result.
I also have a newer laptop that boots Win7 & Ubuntu 12.04 (Toshiba Portege). This has a "built-in" USB 3.0 port and lspci says it also has the NEC controller chip (uPD720200 in lspci -v). On this machine, under ubuntu I *do* get a SuperSpeed connection (every time). I also apparently get a SuperSpeed connection under Win7 (The only way I know to tell this is a speed test - Seq. Read at 100+ Mbytes/sec).
I am beginning to think that the ICH9 PCI implementation is the culprit and perhaps the NEC chip and the ICH9 don't get along - or perhaps it is this mobo, or (hopefully) it is some subtle issue in the driver?
Any ideas?
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