The problem relates directly to the old one: http://thread.gmane.org/gmane.linux.usb.general/20816/focus=20850 The problem is, that usually (in fact all the time with one! exception so far) the card is recognized by operating system as a full-speed (FS) device not the high-speed (HS) one. This is weird, but once I have seen it was recognized as high-speed device at my CPU. But that happened once - I have no idea how and why. My suspicions is that during initialization there is a kind of races that usually lead to full-speed configuration. The FS operation is not enough since the card performance is limited or (worse) the card is not possible to use since there are other USB devices connected (not enough bandwidth). One of the possible cause given in the mentioned thread was that the card requires special initialization. This is not the case in my opinion since I have seen it was initialized as a HS device with completely different characteristics (more high precision and high sampling rate modes of operation). The computer to which the card is connected is uTCA embedded CPU with high-speed USB hub. It runs Ubuntu 10.04 (Linux mskcpucmtb1 2.6.32-45-generic #102-Ubuntu SMP Wed Jan 2 22:38:04 UTC 2013 x86_64 GNU/Linux). I have checked the same behavior with pure 3.9.2 kernel compiled by me - for all cases FS device was configured. The only case when the device was configured as HS device happened once with other machine (not available at this moment). But it is not related to this particular machine since I have tried many times on this machine later and always it was configured as FS device. I have read several problem reports concerning these cards at Internet (most of them seem to be related to FS configuration). Certainly I can provide more information (logs, CPU setup etc.). Does anybody have any idea what can be the problem? The card is recognized as HS device by MS Windows (XP version) without any exceptions... Below I have enclosed a part of lsusb -v dump for both cases (FS and HS configuration). The dumps were taken on different occasions therefore the bus numbers etc. are different. ===== lsusb -v (part of, with FS configuration) Bus 001 Device 008: ID 041e:30df Creative Technology, Ltd Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x041e Creative Technology, Ltd idProduct 0x30df bcdDevice 1.00 iManufacturer 1 Creative Technology Ltd iProduct 2 SB X-Fi Surround 5.1 Pro iSerial 3 000004vk bNumConfigurations 1 ===== lsusb -v (part of, with HS configuration) Bus 003 Device 005: ID 041e:30df Creative Technology, Ltd Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x041e Creative Technology, Ltd idProduct 0x30df bcdDevice 1.00 iManufacturer 1 iProduct 2 iSerial 3 bNumConfigurations 1 The full HS dump I can provide of course (I have stored it), but I doubt whether I can again establish again this mode of operation on request... Thanks in advance for any help. Mariusz Grecki -- 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
