Description of problem: CPU scaling is not working on Intel Xeon E5335 and E5420, although both support Enhanced Intel Speedstep® Technology. http://processorfinder.intel.com/details.aspx?sSpec=SLAEK http://processorfinder.intel.com/details.aspx?sSpec=SLAC7 http://processorfinder.intel.com/details.aspx?sSpec=SLANV Version-Release number of selected component (if applicable): All How reproducible: Everytime Steps to Reproduce: 1. Install RHEL 5.2 2. ls /sys/devices/system/cpu/cpu0/ | grep cpufreq Actual results: Nothing return Expected results: cpufreq Additional info: Intel Xeon E5335 is used on Intel server board S5000PAL, Intel Xeon 5345 on the same board is working correctly (CPU scaling is working). Intel Xeon E5420 is used on Intel server board S5400SF. Intel Xeon E5420 cpu scaling tested on kernel and kernel-xen, results are the same.
The issue with Intel xeon cpu E5420 frequency scaling on Intel server board S5400SF on kernel/kernel-xen was fixed with new firmware
Closing as no longer an issue from Comment 2