Red Hat Bugzilla – Bug 475658
[LTC 5.4 FEAT] Enable Power Button on Cell Blades 
Last modified: 2009-09-02 04:15:59 EDT
Emily J. Ratliff <email@example.com> -
1. Feature Overview:
Feature Id: 
a. Name of Feature: Enable Power Button on Cell Blades
b. Feature Description
This feature request adds support for the power button on IBM Cell blades. It actually doesn't shut
down the machine. Instead it exposes an input device /dev/input/event0 to userspace which sends
KEY_POWER if power button has been pressed.
2. Feature Details:
Arch Specificity: Purely Arch Specific Code
Affects Core Kernel: Yes
Delivery Mechanism: Backport
Request Type: Kernel - Enhancement from Upstream
d. Upstream Acceptance: Accepted
Sponsor Priority 1
f. Severity: High
IBM Confidential: no
Code Contribution: IBM code
g. Component Version Target: kernel 2.6.27
3. Business Case
Further usability enhancement to leverage the Cell platform
4. Primary contact at Red Hat:
5. Primary contacts at Partner:
Project Management Contact:
Hanns-Joachim Uhl, firstname.lastname@example.org, 49-7031-16-4198
Hanns-Joachim Uhl, email@example.com
See also LTC bug 46067 - RIT 190135 - Power Button not working on Cell Blades to shutdown the blade for more information.
IBM is signed up to test and provide feedback.
*** Bug 46067 has been marked as a duplicate of this bug. ***
Hello Red Hat,
fyi ... for this RHEL5.4 feature request also the most current BMC firmware for QS22 from
has to be installed on the QS22 ...
... and this feature works only on QS22, not on QS21.
Thanks for your support.
RHKL post 1/2:
this test procedure can be used to test the powerbutton:
1. ssh into the machine with X forwarding (or use a vnc session)
2. run "modprobe cbe_powerbutton"
3. run "gnome-power-preferences" and configure "shutdown" as action for powerbutton (default is "ask me")
4. run "gnome-power-manager"
5. press the powerbutton
System will power down now.
To have gnome-power-manager without X forwarding one would need to start gdm (and thus gnome-power-manager) on top of Xvnc or Xvfb.
Updating PM score.
You can download this test kernel from http://people.redhat.com/dzickus/el5
Please do NOT transition this bugzilla state to VERIFIED until our QE team
has sent specific instructions indicating when to do so. However feel free
to provide a comment indicating that this fix has been verified.
This enhancement request was evaluated by the full Red Hat Enterprise Linux
team for inclusion in a Red Hat Enterprise Linux minor release. As a
result of this evaluation, Red Hat has tentatively approved inclusion of
this feature in the next Red Hat Enterprise Linux Update minor release.
While it is a goal to include this enhancement in the next minor release
of Red Hat Enterprise Linux, the enhancement is not yet committed for
inclusion in the next minor release pending the next phase of actual
code integration and successful Red Hat and partner testing.
I verified the module loads cleanly and displays information in dmesg:
[root@c4b5 ~]# modprobe cbe_powerbutton
[root@c4b5 ~]# dmesg
pmi: found pmi device at addr d000080080cd0000.
input: Power Button as /class/input/input0
Thanks for including the patch.
~~ Attention Partners RHEL 5.4 Partner Alpha Released! ~~
RHEL 5.4 Partner Alpha has been released on partners.redhat.com. There should
be a fix present that addresses this particular request. Please test and report back your results here, at your earliest convenience. Our Public Beta release is just around the corner!
If you encounter any issues, please set the bug back to the ASSIGNED state and
describe the issues you encountered. If you have verified the request functions as expected, please set your Partner ID in the Partner field above to indicate successful test results. Do not flip the bug status to VERIFIED. Further questions can be directed to your Red Hat Partner Manager. Thanks!
~~ Attention - RHEL 5.4 Beta Released! ~~
RHEL 5.4 Beta has been released! There should be a fix present in the Beta release that addresses this particular request. Please test and report back results here, at your earliest convenience. RHEL 5.4 General Availability release is just around the corner!
If you encounter any issues while testing Beta, please describe the issues you have encountered and set the bug into NEED_INFO. If you encounter new issues, please clone this bug to open a new issue and request it be reviewed for inclusion in RHEL 5.4 or a later update, if it is not of urgent severity.
Please do not flip the bug status to VERIFIED. Only post your verification results, and if available, update Verified field with the appropriate value.
Questions can be posted to this bug or your customer or partner representative.
------- Comment From firstname.lastname@example.org 2009-07-09 04:37 EDT-------
Verified in RHEL 5.4 Beta .. closing Bugzilla
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.