Red Hat Bugzilla – Bug 463690
[LTC 6.0 FEAT] 201583:Include ACPI tstate support (processor throttling control)
Last modified: 2010-11-11 11:04:50 EST
Emily J. Ratliff <firstname.lastname@example.org> - 2008-09-16 18:18 EDT
1. Feature Overview:
Feature Id: 
a. Name of Feature: Include ACPI tstate support (processor throttling control)
b. Feature Description
IBM's power management strategy requires that the OS be able to support processor throttling
control. This is in support of IBM's Active Energy Manager. This support has already been
incorporated upstream. See ACPI specification v3.0b, section 8.4.3.
2. Feature Details:
Arch Specificity: Purely Common Code
Affects Core Kernel: Yes
Affects Kernel Modules: Yes
Delivery Mechanism: Direct from community
Request Type: Kernel - Enhancement from Upstream
d. Upstream Acceptance: Accepted
Sponsor Priority 1
f. Severity: High
IBM Confidential: no
Code Contribution: no
g. Component Version Target: ACPI specification v3.0b, section 8.4.3.
3. Business Case
To support IBM's power management strategy and customer demand for improved power management control
4. Primary contact at Red Hat:
5. Primary contacts at Partner:
Project Management Contact:
Monte Knutson, email@example.com, 877-894-1495
Kevin Stansell, firstname.lastname@example.org
Chris McDermott, email@example.com
Deneen T. Dock, firstname.lastname@example.org
RHEL 6 will include a recent upstream kernel, so this should not be a problem.
The feature requested has already been accepted into the upstream code base
planned for the next major release of Red Hat Enterprise Linux.
When the next milestone release of Red Hat Enterprise Linux 6 is available,
please verify that the feature requested is present and functioning as
in Red Hat CVS Tree Marking as Accepted
------- Comment From email@example.com 2010-05-20 18:34 EDT-------
I verified that throttling states are supported in the Linux kernel in RHEL6 snap 4 (2.6.32-25.el6.x86_64).
The states are correctly represented in
I will mark this as verified.
Checked in sysfs for:
confirmed info existed for cooling devices and thermal zones.
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.