Re: [gentoo-user] new machine : mouse trouble : solved by accident

[Paul Hartman <paul.hartman+gentoo@gmail.com>]

On Fri, Sep 14, 2012 at 6:21 AM, Michael Mol <mikemol@gmail.com> wrote:
> On Fri, Sep 14, 2012 at 12:24 AM, Walter Dnes <waltdnes@waltdnes.org> wrote:
>>
>> On Thu, Sep 13, 2012 at 10:06:01PM -0400, Philip Webb wrote
>>
>> > The effect is quite bizarre & it was the gods who saved me :
>> > if I hadn't happened to plug the mouse into the neighbouring port,
>> > I could have spent days struggling to find out what was wrong
>> > & even taken the mobo back to the store as defective.
>> >
>> > Both Mageia -- installed from USB stick in a partition on the
>> > HDD -- & System Rescue show  /dev/input/mouse0  after booting ;
>> > in the case of SR it does it before I enter the GUI via 'wizard'.
>> > They have no problem with the 2.0/1.1 port, but the Gentoo system as
>> > I've installed it don't show  /dev/input/mouse0 from that port, but
>> > only if I plug the mouse into the 3.0/2.0 port.  Someone suggested
>> > it is caused by a Kernel .config setting, which if enabled seems to
>> > force the system to look in the 3.0 port.  Why it should do that
>> > doesn't make much sense : such upgrades are usually permissive,
>> > not restrictive.  BTW there's no difference between 3.4.9 & 3.5.3 .
>>
>>   Is the cpu AMD?  Intel machines require UHCI (USB 1.1) and AMD
>> machines require OHCI (USB 1.0) for lowspeed USB devices like keyboards
>> and mice.  There's a root hub translator selection in .config that's
>> *SUPPOSED* to work with keyboards+mice, using only the EHCI kernel
>> driver, but I never could get it to work.
>
>
> UHCI vs OHCI has nothing to do with the CPU, but with the chipset on the
> system. I haven't seen an OHCI-supporting chip in over a decade, either, and
> most of my systems have been AMD.
>
> Either way, there's no harm in enabling both.

On my laptop (circa 2004) I have to load the USB modules (?HCI) in a
specific order otherwise things don't work properly. I don't remember
what that order is, exactly, as I'm not using it at the moment, but
thought I'd mention it FWIW...