Messages in this thread | | | Date | Mon, 30 Sep 2002 17:47:45 -0400 (EDT) | From | Maxwell Spangler <> | Subject | Re: AMD 768 erratum 10 (solved: AMD 760MPX DMA lockup) |
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Does this mouse have to be actively used...
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 -----------| > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
-- ---------------------------------------------------------------------------- Maxwell Spangler Program Writer Greenbelt, Maryland, U.S.A. Washington D.C. Metropolitan Area
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