Re: io_apic & timer_ack fix

From: Maciej W. Rozycki (macro_at_ds2.pg.gda.pl)
Date: 04/13/04

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    Date:	Tue, 13 Apr 2004 14:20:28 +0200 (CEST)
To: Ross Dickson <ross@datscreative.com.au>

    On Sat, 10 Apr 2004, Ross Dickson wrote:

    > > Was it determined that the fix was bogus? damaging? fixable?
    >
    > I thought the patch was OK with typos fixed.

     I consider it final.

    > Thomas was tracking down C1 C2 etc states but I do not know the results of
    > his search?
    > http://marc.theaimsgroup.com/?l=linux-kernel&m=107972277920929&w=2
    > Was it a problem only with one machine?

     The effect seems impossible, but I can't discuss with facts. I need to
    get at AMD processor documents to find out what are the conditions to
    switch between the power-save states. Perhaps this is yet another SMM
    bug. E.g. the pair of PIC poll I/O accesses interacts with the SMM
    somehow.

     Unfortunately I lack time to dig into it right now -- perhaps someone
    else can do the research? 

    -- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +
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