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

[Michael Mol <mikemol@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1677 bytes --]

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.

-- 
:wq

[-- Attachment #2: Type: text/html, Size: 2190 bytes --]