I have problems with 2 machines - one with an Intel Duo (first listing) and another with an AMD Athlon64 (second listing). My Dell laptop with a Pentium-M seems to be working OK though. The Intel Duo board has the latest BIOS. I tried to update the BIOS in the Athlon64 board but the latest BIOS "killed" my ethernet (VIA chipset) so I had to roll back to the original BIOS. [shirley99cr@shirley ~]$ dmesg | grep cpufreq cpufreqd[2129]: segfault at 1c ip b7e60244 sp bfc03adc error 4 in libsysfs.so.2.0.1[b7e5b000+b000] [shirley99cr@shirley ~]$ su -c "/sbin/service cpufreqd status" Password: cpufreqd dead but subsys locked [shirley99cr@shirley ~]$ uname -a Linux shirley 2.6.27.5-desktop-2mnb #1 SMP Thu Nov 20 15:20:32 EST 2008 i686 Intel(R) Pentium(R) Dual CPU E2200 @ 2.20GHz GNU/Linux [shirley99cr@shirley ~]$ rpm -qa | grep cpufreqd libcpufreqd-2.3.3-1mdv2009.0 cpufreqd-2.3.3-1mdv2009.0 [shirley99cr@shirley ~]$ cpufreq-info cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006 Report errors and bugs to cpufreq@xxxxxxxxxxxxxxx, please. analyzing CPU 0: driver: acpi-cpufreq CPUs which need to switch frequency at the same time: 0 hardware limits: 1.20 GHz - 2.20 GHz available frequency steps: 2.20 GHz, 1.60 GHz, 1.20 GHz available cpufreq governors: ondemand, conservative, powersave, userspace, performance current policy: frequency should be within 1.20 GHz and 2.20 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 1.20 GHz. analyzing CPU 1: driver: acpi-cpufreq CPUs which need to switch frequency at the same time: 1 hardware limits: 1.20 GHz - 2.20 GHz available frequency steps: 2.20 GHz, 1.60 GHz, 1.20 GHz available cpufreq governors: ondemand, conservative, powersave, userspace, performance current policy: frequency should be within 1.20 GHz and 2.20 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 1.20 GHz. Athlon64 box: [n0sq@server2 ~]$ cpufreq-info cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006 Report errors and bugs to cpufreq@xxxxxxxxxxxxxxx, please. analyzing CPU 0: driver: powernow-k8 CPUs which need to switch frequency at the same time: 0 hardware limits: 1000 MHz - 2.00 GHz available frequency steps: 2.00 GHz, 1.80 GHz, 1000 MHz available cpufreq governors: ondemand, conservative, powersave, userspace, performance current policy: frequency should be within 1000 MHz and 2.00 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 1000 MHz. [n0sq@server2 ~]$ dmesg | grep powernow powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3000+ processors (1 cpu cores)(version 2.20.00) powernow-k8: 0 : fid 0xc (2000 MHz), vid 0x2 powernow-k8: 1 : fid 0xa (1800 MHz), vid 0x6 powernow-k8: 2 : fid 0x2 (1000 MHz), vid 0x12 powernow-k8: ph2 null fid transition 0xc powernow-k8: Hardware error - pending bit very stuck - no further pstate changes possible powernow-k8: transition frequency failed powernow-k8: failing targ, change pending bit set powernow-k8: error - out of sync, fix 0x2 0xc, vid 0x0 0x0 powernow-k8: ph2 null fid transition 0xc [n0sq@server2 ~]$ dmesg | grep cpufreqd cpufreqd[2053]: segfault at 1c ip b80bc244 sp bf8e607c error 4 in libsysfs.so.2.0.1[b80b7000+b000] [n0sq@server2 ~]$ su -c "/sbin/service cpufreqd status" Password: cpufreqd dead but subsys locked [n0sq@server2 ~]$ uname -a Linux server2 2.6.27.4-desktop-2mnb #1 SMP Thu Nov 6 13:00:14 EST 2008 i686 AMDAthlon(tm) 64 Processor 3000+ GNU/Linux [n0sq@server2 ~]$ rpm -qa | grep cpufreqd cpufreqd-2.3.3-1mdv2009.0 libcpufreqd-2.3.3-1mdv2009.0