Solve the problem that the USB flash disk cannot be recognized in Ubuntu.

Ubuntu 7.04 installed on IBM T40 has been upgraded to the latest version in the new version.
After the USB flash drive is inserted, the system does not respond.
# Lsusb
You cannot see any device information. If you insert a USB mouse, you can identify it and use it normally.
I have installed Ubuntu on a desktop computer and a Compaq notebook before, and can recognize the USB flash drive normally.
For other USB flash drives, you can confirm that they are not USB flash drives.

No one seems to have encountered this problem when searching on Google. Most people cannot mount them automatically, but it seems to me
Didn't even recognize the hardware ?!
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Use dmesg to view USB information:

[1885.556000] USB 4-4: new high speed USB device using ehci_hcd and address 114
[1887.824000] USB 4-4: new high speed USB device using ehci_hcd and address 122
[1888.328000] USB 4-4: new high speed USB device using ehci_hcd and address 123
[2, 1893.116000] USB 4-4: new high speed USB device using ehci_hcd and address 15
[2, 1897.652000] USB 4-4: new high speed USB device using ehci_hcd and address 32
[2, 1899.668000] USB 4-4: new high speed USB device using ehci_hcd and address 39
[2, 1900.172000] USB 4-4: new high speed USB device using ehci_hcd and address 40
[2, 1904.204000] USB 4-4: new high speed USB device using ehci_hcd and address 55
[2, 1907.984000] USB 4-4: new high speed USB device using ehci_hcd and address 69
[2, 1909.244000] USB 4-4: new high speed USB device using ehci_hcd and address 73
[1915.040000] USB 4-4: new high speed USB device using ehci_hcd and address 95
[1917.812000] USB 4-4: new high speed USB device using ehci_hcd and address 105
[1918.072000] ehci_hcd 0000: 00: 1d. 7: Port 4 reset error-110
[1918.072000] hub 4-0. 0: hub_port_status failed (ERR =-32)
[2, 1927.136000] USB 4-4: new high speed USB device using ehci_hcd and address 13
[2, 1927.640000] USB 4-4: new high speed USB device using ehci_hcd and address 14
[2, 1935.200000] USB 4-4: new high speed USB device using ehci_hcd and address 43
[1935.460000] ehci_hcd 0000: 00: 1d. 7: Port 4 reset error-110
[1935.460000] hub 4-0. 0: hub_port_status failed (ERR =-32)
[2, 1937.216000] USB 4-4: new high speed USB device using ehci_hcd and address 48
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Solve the problem and execute
Rmmod ehci_hcd
OK.
The EHCI may be related to the USB support. Refer to the following section:
Http://blog.csdn.net/ryman/archive/2004/11/02/162947.aspx
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To understand "EHCI" and what it is like, you must first know that each motherboard or PCI Card that supports inserting a USB device requires a USB master controller chipset. This special chipset operates with the USB device that is inserted into the system and handles all low-level details necessary to allow the USB device to communicate with other parts of the system.
Linux USB drivers have three different USB master controller options because there are three different types of USB chips on the motherboard and PCI Card. The "EHCI" driver is designed to achieve new high-speed
USB 2.0 chips are supported. The "OHCI" driver is used on a non-PC system (and on a PC board with an SIS and Ali chipset)
USB chips are supported. The "uhci" driver is used to support USB implementations on most other PC boards, including Intel and. Just select and hope
"? HCI driver. If you have any questions, you can enable "EHCI" and "uhci" for the sake of insurance.
There are obvious differences) and "OHCI ". (Zhao Ming Note: According to the document, EHCI already includes uhci and OHCI, but currently I personally test it. It is not feasible to add EHCI separately. Generally, I do
The uhci or OHCI is loaded Based on the motherboard type before EHCI is loaded ).

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