Re: io_apic & timer_ack fix

[Maciej W. Rozycki]

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@xxxxxxxxxxxxx, PGP key available        +
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