Intel Turbo Boost 2 doesn't work on Sandy Bridge E5-26XX servers.

Issue

• Intel Turbo Boost 2 doesn't work on Sandy Bridge E5-26XX servers.
• Running below command doesn't show usual acpi modules like acpi_cpufreq , freq_table and mperf:

#lsmod|grep acpi

• Running below command produce errors:

#cpufreq-info
cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to <a class="make_room_for_kcs" href="mailto:cpufreq@vger.kernel.org">cpufreq@vger.kernel.org</a>, please.
analyzing CPU 0:
  no or unknown cpufreq driver is active on this CPU
analyzing CPU 1:
  no or unknown cpufreq driver is active on this CPU
analyzing CPU 2:
  no or unknown cpufreq driver is active on this CPU
analyzing CPU 3:
  no or unknown cpufreq driver is active on this CPU

• Running below command produce error for non-existing device:

#modprobe acpi_cpufreq
FATAL: Error inserting acpi_cpufreq (/lib/modules/2.6.18-274.7.1.el5/kernel/arch/x86_64/kernel/cpufreq/acpi-cpufreq.ko): No such device