我有一个朋友决定从 Windows 切换到 Linux。我正在帮助她尽快启动并运行，但我们遇到了一个我似乎无法解决的问题。
她使用 Debian Wheezy，从最新的 XFCE 安装 CD 映像安装（dd安装到随身碟上）。一切都很顺利，她的系统几乎完全正常工作。
她唯一的问题是她的一些随身碟无法工作。它们可以mounted（通过 root 和通过 xfce 的自动挂载），但从驱动器读取会超时，dmesg表明ehci_hcd不断重置 USB2 设备。
作为修复，我rmmod编辑了ehci_hcd内核模块，设备开始工作，但速度太慢了。
作为另一个可能的解决方案，我将盒子的内核升级到wheezy-backports3.10，但问题仍然存在。我已经检查了她的BIOS设置，但它们似乎也正常。
驱动器在我的笔记本电脑下工作，USB 端口在以前的操作系统下工作，所以这不是硬件问题。
我已经不知道还能做些什么来修理她的盒子了。
这是dmesg当前错误的输出：
[ 3694.256023] usb 7-2: new high-speed USB device number 5 using ehci-pci
[ 3694.388813] usb 7-2: New USB device found, idVendor=1e3d, idProduct=2095
[ 3694.388818] usb 7-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3694.388821] usb 7-2: Product: Flash Disk
[ 3694.388823] usb 7-2: Manufacturer: Generic
[ 3694.388825] usb 7-2: SerialNumber: CCBB0201160720281014278106
[ 3694.389132] usb-storage 7-2:1.0: USB Mass Storage device detected
[ 3694.389234] scsi9 : usb-storage 7-2:1.0
[ 3695.388487] scsi 9:0:0:0: Direct-Access Generic Flash Disk 5.00 PQ: 0 ANSI: 2
[ 3695.388770] sd 9:0:0:0: Attached scsi generic sg3 type 0
[ 3695.389346] sd 9:0:0:0: [sdb] 3911680 512-byte logical blocks: (2.00 GB/1.86 GiB)
[ 3695.389970] sd 9:0:0:0: [sdb] Write Protect is off
[ 3695.389973] sd 9:0:0:0: [sdb] Mode Sense: 0b 00 00 08
[ 3695.390591] sd 9:0:0:0: [sdb] No Caching mode page present
[ 3695.390595] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 3695.394223] sd 9:0:0:0: [sdb] No Caching mode page present
[ 3695.394228] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 3695.395392] sdb: sdb1
[ 3695.401344] sd 9:0:0:0: [sdb] No Caching mode page present
[ 3695.401350] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 3695.401354] sd 9:0:0:0: [sdb] Attached SCSI removable disk
[ 3710.357646] FAT-fs (sdb1): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
[ 3710.380122] FAT-fs (sdb1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 3741.008027] usb 7-2: reset high-speed USB device number 5 using ehci-pci
[ 3751.252026] usb 7-2: reset high-speed USB device number 5 using ehci-pci
[ 3767.496024] usb 7-2: reset high-speed USB device number 5 using ehci-pci
[ 3767.744027] usb 7-2: reset high-speed USB device number 5 using ehci-pci
[ 3777.988055] usb 7-2: reset high-speed USB device number 5 using ehci-pci
[ 3778.120554] sd 9:0:0:0: Device offlined - not ready after error recovery
[ 3778.120586] sd 9:0:0:0: [sdb] Unhandled error code
[ 3778.120589] sd 9:0:0:0: [sdb]
[ 3778.120591] Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK
[ 3778.120593] sd 9:0:0:0: [sdb] CDB:
[ 3778.120595] Read(10): 28 00 00 00 00 42 00 00 ce 00
[ 3778.120602] end_request: I/O error, dev sdb, sector 66
[ 3778.120619] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.120688] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.120690] sd 9:0:0:0: killing request
[ 3778.120724] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.120740] FAT-fs (sdb1): FAT read failed (blocknr 34)
[ 3778.124088] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.124269] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.124282] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.124292] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.124302] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.124311] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.124366] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.124377] sd 9:0:0:0: rejecting I/O to offline device
... This repeats a lot of times, then ...
[ 3778.126304] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.126314] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.126323] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.126408] sd 9:0:0:0: rejecting I/O to offline device
[ 3778.126415] FAT-fs (sdb1): FAT read failed (blocknr 34)