Could one plug a cheap ps/2 mouse into that port and yet continue to use a USB
mouse if X is configured to use it?
What is actually happening that causes the ps/2 mouse to cure this or any
other problem of this nature?
Curious.
On Fri, 27 Sep 2002, Jan Kasprzak wrote:
> Manfred Spraul wrote:
> : The errata is not PS/2 mouse specific:
> : it says that the io apic doesn't implement masking interrupts correctly.
>
> Yes, but it says that problem has not been observed when running
> with PS/2 mouse. Which is exactly what I observe on my system.
> :
> : Linux uses masking aggressively - disable_irq() is implemented by
> : masking the interrupt in the io apic. I'm surprised that this doesn't
> : cause frequent problems.
>
> The errata does not say that the interrupt masking in the IO-APIC
> does not work in all situations. I read it as the lock-up (caused by
> nonfunctional IRQ masking) sometimes occurs, nobody knows when,
> and it has been observed on some Netware boxes w/o the PS/2 mouse.
> Maybe even AMD does not know exactly what is going on there.
>
> : Regarding Jan's problem: I'm not sure if his problems are related to
> : this errata. It says that using a PS/2 mouse instead of a serial mouse
> : with Novell Netward avoids the hang during shutdown, probably because
> : then netware doesn't mask the irq.
>
> Yes, it may be a faulty board as well, but I think it is
> too close to this AMD errata.
>
> -Yenya
>
> --
> | Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> |
> | GPG: ID 1024/D3498839 Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
> | http://www.fi.muni.cz/~kas/ Czech Linux Homepage: http://www.linux.cz/ |
> |----------- If you want the holes in your knowledge showing up -----------|
> |----------- try teaching someone. -- Alan Cox -----------|
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