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Old 05-09-2007, 03:50 AM   #1
Registered: Jan 2004
Distribution: Kubuntu 14.04 (Dell Linux-preinstalled laptop + 2 other laptops)
Posts: 117

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USB 2.0 ports: devices not detected, but works fine with USB 1.1 ports (Kubuntu 6.06)

I tried going through the forums, but didn't find threads describing my situation, which is:

I newly installed USB 2.0 ports on my Kubuntu (6.06 Dapper) desktop. When I plug in devices (e.g. SD/CF card reader), they are not detected. However, on the same computer, if I plug the same devices into the USB 1.1 ports, then they are detected, Kubuntu shows them under "media:/", I can mount them and read/write.

"dmesg" shows EHCI detected. "lsmod" shows "usb_storage", "ehci_hcd", etc. "lshal" output mentions "USB 2.0", but I'm not that familiar with the "lshal" output". Let me know if you need the output from any command pasted.

What should be my next step to find out why USB 1.1 works but USB 2.0 doesn't? I need to get this installed so I can back up my hard drive onto a removable drive, at reasonable speed.

Thanks for any advice.
Old 05-09-2007, 05:42 AM   #2
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Registered: Aug 2001
Location: Fargo, ND
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Maybe you need to modprobe a kernel module:
jschiwal@hpmedia:~> lsmod | grep usb
usbhid                 69792  0
usb_storage           105280  4
usbcore               148064  6 uhci_hcd,usbhid,usb_storage,ohci_hcd,ehci_hcd,ndiswrapper
scsi_mod              173744  5 sr_mod,usb_storage,sg,libata,sd_mod
ide_core              174720  5 usb_storage,ide_cd,siimage,amd74xx,ide_disk
jschiwal@hpmedia:~> lsmod | grep hcd
uhci_hcd               42520  0
ohci_hcd               38404  0
ehci_hcd               51080  0
usbcore               148064  6 uhci_hcd,usbhid,usb_storage,ohci_hcd,ehci_hcd,ndiswrapper


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