Athlon-Powersaving

On my system (AthlonXP 2000+) the idle-temperature has fallen from 51°C in addition with kernel 2.4.28 and acpi even to 34°C. These commands work at the moment only for single-processor-systems and KT133/133A, KX133, KT266/266A and AMD760 based Motherboards.
So do the following:

• get root
• cd /usr/src/linux
• make menuconfig (or xconfig or whatever)
• enable the following options in general setup:
  • Power Management support
  • acpi support
  • acpi bus manager
  • system
  • processor
  • button
• Save your new config, make a new kernel, install it and reboot.

If you have acpi enabled you can enable/disable the power saving from the command line with the following commands (WARNING: on some systems this can cause a system hang - so do it at your own risk!):

• get root
• on KT133/133a and KT133:
  enable: setpci -v -H1 -s 0:0.0 52=EB
  disable: setpci -v -H1 -s 0:0.0 52=6B
• on KT266/266a:
  enable: setpci -v -H1 -s 0:0.0 92=EB
  disable: setpci -v -H1 -s 0:0.0 92=6Bi
• on MSI K7T266Pro (MS-6380) (KT266) and KT333 based Motherboards:
  enable:
  setpci -v -H1 -s 0:0.0 70=86
  setpci -v -H1 -s 0:0.0 95=1e
  disable:
  setpci -v -H1 -s 0:0.0 70=82
  setpci -v -H1 -s 0:0.0 95=1c
• on AMD760/AMD761:
  enable: setpci -s 0:0.0 0x62=0xb7
  disable: setpci -s 0:0.0 0x62=0xb1
• on KT400: (experimental)
  enable: setpci -v -H1 -s 0:0.0 D2=EB
• on sis730: (experimental)
  enable: setpci -s 0:0.0 6b=0x19
  disbale: setpci -s 0:0.0 6b=0x18