On Fri, Sep 14, 2012 at 6:21 AM, Michael Mol <[email protected]> wrote: > On Fri, Sep 14, 2012 at 12:24 AM, Walter Dnes <[email protected]> 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...
