可能重复：
USB 3.0 卡无法识别
我刚刚安装了 Ubuntu 10.10。我在 USB 3.0 上有外置硬盘。尝试通过 PCI Express NEC 控制器连接它。
dmesg：
[ 8966.820078] usb 6-3: new high speed USB device using xhci_hcd and address 0
[ 8966.839831] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 8966.840580] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 8966.841329] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 8966.842079] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 8966.843343] scsi8 : usb-storage 6-3:1.0
[ 8967.847144] scsi 8:0:0:0: Direct-Access SAMSUNG HD204UI 1AQ1 PQ: 0 ANSI: 5
[ 8967.847589] sd 8:0:0:0: Attached scsi generic sg2 type 0
[ 8967.847923] sd 8:0:0:0: [sdb] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[ 8967.848341] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 8967.850959] sd 8:0:0:0: [sdb] Write Protect is off
[ 8967.850963] sd 8:0:0:0: [sdb] Mode Sense: 23 00 00 00
[ 8967.850966] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 8967.851818] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 8967.852365] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 8967.852370] sdb: sdb1
[ 8967.871315] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 8967.871853] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 8967.871856] sd 8:0:0:0: [sdb] Attached SCSI disk
[ 8967.950728] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 8967.951355] sd 8:0:0:0: [sdb] Sense Key : Recovered Error [current] [descriptor]
[ 8967.951361] Descriptor sense data with sense descriptors (in hex):
[ 8967.951363] 72 01 04 1d 00 00 00 0e 09 0c 00 00 00 00 00 00
[ 8967.951375] 00 00 00 00 00 50
[ 8967.951380] sd 8:0:0:0: [sdb] ASC=0x4 ASCQ=0x1d
[ 8968.790076] xhci_hcd 0000:02:00.0: HC died; cleaning up
[ 8968.790076] usb 6-3: USB disconnect, address 2
[ 8999.008554] scsi 8:0:0:0: [sdb] Unhandled error code
[ 8999.008558] scsi 8:0:0:0: [sdb] Result: hostbyte=DID_TIME_OUT driverbyte=DRIVER_OK
[ 8999.008562] scsi 8:0:0:0: [sdb] CDB: Read(10): 28 00 74 70 97 39 00 00 3e 00
[ 8999.008573] end_request: I/O error, dev sdb, sector 1953535801
[ 8999.008578] Buffer I/O error on device sdb1, logical block 1953535738
[ 8999.008582] Buffer I/O error on device sdb1, logical block 1953535739
[ 8999.008585] Buffer I/O error on device sdb1, logical block 1953535740
[ 8999.008589] Buffer I/O error on device sdb1, logical block 1953535741
[ 8999.008592] Buffer I/O error on device sdb1, logical block 1953535742
[ 8999.008595] Buffer I/O error on device sdb1, logical block 1953535743
[ 8999.008600] Buffer I/O error on device sdb1, logical block 1953535744
[ 8999.008603] Buffer I/O error on device sdb1, logical block 1953535745
[ 8999.008606] Buffer I/O error on device sdb1, logical block 1953535746
[ 8999.008609] Buffer I/O error on device sdb1, logical block 1953535747
[ 8999.008642] scsi 8:0:0:0: rejecting I/O to offline device
[ 8999.008747] scsi 8:0:0:0: [sdb] Unhandled error code
[ 8999.008749] scsi 8:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[ 8999.008752] scsi 8:0:0:0: [sdb] CDB: Read(10): 28 00 74 70 97 77 00 00 3e 00
[ 8999.008760] end_request: I/O error, dev sdb, sector 1953535863
sudo lspci-v
2:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) (prog-if 30)
Physical Slot: 32
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at fe9fe000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [50] Power Management version 3
Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+
Capabilities: [90] MSI-X: Enable- Count=8 Masked-
Capabilities: [a0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number ff-ff-ff-ff-ff-ff-ff-ff
Capabilities: [150] #18
Kernel driver in use: xhci_hcd
Kernel modules: xhci-hcd
如果我尝试将任何 USB 2.0 插入此控制器，它都可以正常工作。但 USB 3.0 不行。有什么想法吗？