Does FC3 issue halt to Athlon XP cpus when idle?

[Dave Jones]

On Wed, Apr 13, 2005 at 03:37:51AM +0200, Alexander Dalloz wrote:
 > Am Mi, den 16.03.2005 schrieb Steve Bergman um 12:23:
 > 
 > > I know that at one time the kernel did not issue a halt instruction to 
 > > athlon cpus due to some sort of bug that caused some athlons not to wake 
 > > up again.
 > > 
 > > Is this still true on, e.g., an Athlon XP 2100+ with the current FC3 kernel?
 > 
 > > Steve
 > 
 > Yes, it is. The halt mode is switched off by BIOS programmers to prevent
 > a possible lookup. On one of my affected systems I used instructions
 > from
 > 
 > http://www.daniel.nofftz.net/linux/
 > 
 > On another I am using lvcool:
 > http://vcool.occludo.net/VC_Linux.html
 > (available as RPM from Fedora.us/Fedora Extras I think)
 > 
 > For my current workstation dual Athlon board I build the amd76x_pm
 > module (Joerg Sommery posted his code on the Linux kernel mailing list)
 > and am using that module. It works great.
 > 
 > All tools will show you their activity by decreasing the CPU temperature
 > when not doing hard work with the PC by 10 to 15 °C.

Be aware that there have been reports of systems locking up when
under load when these modules are loaded.  It seems to be completely
random, and not specific to any particular chipset/board combination.

		Dave