On Wed, Oct 03, 2012 at 09:34:43AM -0400, Don Zickus wrote: > On Tue, Oct 02, 2012 at 02:42:41PM -0700, Sarah Sharp wrote: > > > > USB 3.0 devices are required to support Link PM. However, some of > > > > them don't support U1, or don't support U2, or don't support either. > > > > There is no way in the USB 3.0 specification to say that a device > > > > doesn't support U1 or U2, so these devices set the U1 or U2 exit > > > > latency to the maximum possible values (10ms for U1, 2047ms for U2). > > > > > > It still failed for me. :-( > > > > Can you send me the `sudo lsusb -v` output for the device? Also, please > > see if you can get a new cable and retest. > > I attached the lsusb -v output (had to use another usb3 controller to > obtain it). I can't really use another cable because it comes with its > own usb3 mini cable. All the other usb3 cables I have are the normal > sized ones (with the fatter end). Hah, I think I see the issue: > SuperSpeed USB Device Capability: > bLength 10 > bDescriptorType 16 > bDevCapabilityType 3 > bmAttributes 0x00 > Latency Tolerance Messages (LTM) Supported > wSpeedsSupported 0x000e > Device can operate at Full Speed (12Mbps) > Device can operate at High Speed (480Mbps) > Device can operate at SuperSpeed (5Gbps) > bFunctionalitySupport 1 > Lowest fully-functional device speed is Full Speed (12Mbps) > bU1DevExitLat 0 micro seconds > bU2DevExitLat 0 micro seconds The device is claiming it won't experience *any* exit latency for U1 or U2. That probably means it doesn't support U1 or U2 at all. So we need to blacklist both the max values and the min values. Patch shortly. Sarah Sharp -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
