Re: usb drive nolonger registers on one pc, still registers on another
On Tue, 14 Dec 2010 13:10:20 -0500, Thomas H. George wrote:
> On Tue, Dec 14, 2010 at 10:48:32AM -0500, Thomas H. George wrote:
>> On Tue, Dec 14, 2010 at 12:29:34PM +0000, Camaleón wrote:
>> > You mean the USB hard disk is working properly but logs that output
>> > or you get the errors and the disk is not detected at all?
>>
>> The device is detected, that is the led on the device flashes
>> repeatedly as the system tries to assign a device number and fails.
Okay, but despite the warning, can you list the hard disk with "fdisk -l"?
>> > You can make a quick test: run " dmesg | grep [euo]hci" in both
>> > computers to check what USB module is in charge of the disk. There
>> > are some devices that play better with old "[uo]hci" stack and have
>> > problems when using the new one.
>> >
>> Very interesting. The older system finds only ehci entries in dmesg.
>> The newer system finds both ohci and echi entries and, more
>> importantly, issues a warning that ohci controller is being loaded
>> before the ehci controller. I don't know how to change this. I
>> checked /etc/udev but found no rules regarding usb controllers.
>>
>> Here is the dmesg output for the newer system:
>>
>>
>> [ 0.778844] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [
>> 0.778899] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>> [ 0.778936] Warning! ehci_hcd should always be loaded before
>> uhci_hcd and ohci_hcd, not after
Hum...
> Edited /etc/usb_modeswitch.conf to enable mode switching. Now the ehci
> controller is loaded before the ohci controller. This does not solve
> the problems.
Just for testing purposes... what happens if you disconnect the USB cable
of the UPS unit from the computer and boot up the system afterwards? Are
you getting the same warnings when plugin the USB hard disk and still
fails to be detected with "fdisk -l"?
Greetings,
--
Camaleón
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