RE: PS/2 peripherals

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On Tue, 2007-03-06 at 09:52 -0800, Gareth Howlett wrote:
> Gareth Howlett wrote:
> >
> >
> > We've got a number of computers sitting around the office that don't
> > detect PS/2 peripherals when plugged-in.  If they were plugged-in
> during
> > boot they work just fine, but if they were plugged-in after boot they
> don't.
> >
> > 1)       Anyone here ever heard of this before?
> >
> > 2)       Is there anything I can do about it (force a kernel
> re-detect?)
> >
> >
> >
> > I've checked the BIOS settings and I'm using FC4 (2.6.12-1.1447).
> Dmesg
> > and /var/log/messages don't display anything relevant (in the
> after-boot
> > case).
> >
> First of all, most (all) PS/2 devices are not designed to be
> hotplugged. Depending on the BIOS, it may disable the PS/2 mouse
> connection if there is not a mouse plugged in at boot. There may be
> a BIOS setting for this. But if I remember correctly, this is a
> choice of off or auto.
> 
> Depending on your hardware, you may also be running the risk of
> destroying the PS/2 device or motherboard circuitry.
> 
> Mikkel
> -- 
> 
> Its likely that you have blown the ps2 ports by hot plugging. The bios
> will 
> only report whats plugged into them durring the post test, so if you
> plug in 
> a mouse or key board after the post test has finished the biosdoes not
> see 
> them 
> 
> -- 
> 
> 
> They aren't blown... just unresponsive until after reboot.  I had
> imagined it was much like Mikkel said but I wanted to confirm my
> suspicions.  It's really too bad there isn't a way to ask BIOS to search
> again.  Anyway, no big deal - I figure we've got two options...
> 
> - Live with it.
> 
> - Find a PS/2 adapter which always shows a peripheral connected (I know
> they exist for monitor connections).

Third option, edit /etc/sysconfig/kudzu and set "SAFE=yes".  This
disables PS/2 probes (and some other stuff).  It's worth a try, anyway.

Fourth option, use USB keyboards and mice to get around the issue.  Make
sure you have "legacy" USB support turned on in the BIOS.

> And a note for next time - make sure we have enough PS/2 ports and base
> our KVM on it as well.

If you can, that'll work.  We have 1400 servers so that's not an option
with us.  The kudzu poke fixes a lot of our issues, the USB stuff fixes
even more and is the only way to get around Windows booting without PS/2
peripherals plugged in.  Our crash carts use USB keyboards and mice
along with the USB-PS/2 adapters that come with them.  Our rule is "try
the PS/2 stuff first, then try the USB".

----------------------------------------------------------------------
- Rick Stevens, Principal Engineer          rstevens@xxxxxxxxxxxxxxx -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-     Never put off 'til tommorrow what you can forget altogether!   -
----------------------------------------------------------------------

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