Re: usb drive nolonger registers on one pc, still registers on another
On Tue, 14 Dec 2010 20:23:07 +0000, Russell L. Harris wrote:
> * Camaleón <noelamac@gmail.com> [101214 12:35]:
>> On Mon, 13 Dec 2010 17:16:21 -0500, Thomas H. George wrote:
>>
>> > A Toshiba usb hard drive previously registered with no difficulty on
>> > one computer but still registers with no difficulty on a seconcd
>> > computer.
> ...
>> 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.
>
> Could you please provide instructions for invoking the old stack? I am
> thinking that this might provide a work-around for a flash recorder
> which does not auto-mount.
USB ports can make use of (AFAIK) three different modules: "ohci_hcd" -
loaded for VIA and Intel host controllers-, "uhci_hcd" -loaded for NEC
based ones- (USB 1.1) and "ehci_hcd" (USB 2.0).
The only way I'm aware to enforce the use or one of them is by loading/
unloading the "offending" modules, for example:
# Unload ehci
modprobe -r ehci_hcd
Greetings,
--
Camaleón
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