Bug 158739

Summary: Thermal (fan) control on PowerMacs too verbose
Product: [Fedora] Fedora Reporter: Lyonel Vincent <lyonel>
Component: kernelAssignee: David Woodhouse <dwmw2>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 4CC: davej, wtogami
Target Milestone: ---   
Target Release: ---   
Hardware: powerpc   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2005-08-30 01:50:50 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Attachments:
Description Flags
patch to make fan adjustments appear only in KERN_DEBUG none

Description Lyonel Vincent 2005-05-25 12:18:22 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050513 Galeon/1.3.21

Description of problem:
On (some) Apple PowerMacs (Dual G4s at least), fans are software-controlled.
A kernel module (task [g4fand]) is responsible for tuning the fans.
Every single adjustment to the rotation speed is reported, completely clobbering the output of dmesg or the syslog:
May 25 14:03:00 windtunnel kernel: CPU-temp: 60.1 C, Case: 41.3 C,  Fan: 9 (tuned +1)
May 25 14:03:16 windtunnel kernel: CPU-temp: 60.0 C, Case: 41.3 C,  Fan: 9 (tuned +0)
May 25 14:04:36 windtunnel kernel: CPU-temp: 59.8 C, Case: 41.3 C,  Fan: 8 (tuned -1)
May 25 14:04:44 windtunnel kernel: CPU-temp: 59.9 C, Case: 41.3 C,  Fan: 8 (tuned +0)
May 25 14:05:56 windtunnel kernel: CPU-temp: 60.1 C, Case: 41.3 C,  Fan: 9 (tuned +1)
May 25 14:06:04 windtunnel kernel: CPU-temp: 60.0 C, Case: 41.3 C,  Fan: 9 (tuned +0)
May 25 14:07:32 windtunnel kernel: CPU-temp: 59.8 C, Case: 41.2 C,  Fan: 8 (tuned -1)
May 25 14:07:40 windtunnel kernel: CPU-temp: 59.9 C, Case: 41.3 C,  Fan: 8 (tuned +0)
May 25 14:08:52 windtunnel kernel: CPU-temp: 60.1 C, Case: 41.5 C,  Fan: 9 (tuned +1)
May 25 14:09:00 windtunnel kernel: CPU-temp: 60.0 C, Case: 41.3 C,  Fan: 9 (tuned +0)

Version-Release number of selected component (if applicable):
2.6.11-1.1340_FC4smp

How reproducible:
Always

Steps to Reproduce:
1. boot a 2.6.11 kernel on a dual G4 PowerMac
2. wait until the system finishes starting
3. use dmesg or view syslog (/var/log/messages)
  

Actual Results:  syslog is full of stupid messages, making it unreadable:
May 25 14:03:00 windtunnel kernel: CPU-temp: 60.1 C, Case: 41.3 C,  Fan: 9 (tuned +1)
May 25 14:03:16 windtunnel kernel: CPU-temp: 60.0 C, Case: 41.3 C,  Fan: 9 (tuned +0)
May 25 14:04:36 windtunnel kernel: CPU-temp: 59.8 C, Case: 41.3 C,  Fan: 8 (tuned -1)
May 25 14:04:44 windtunnel kernel: CPU-temp: 59.9 C, Case: 41.3 C,  Fan: 8 (tuned +0)
May 25 14:05:56 windtunnel kernel: CPU-temp: 60.1 C, Case: 41.3 C,  Fan: 9 (tuned +1)
May 25 14:06:04 windtunnel kernel: CPU-temp: 60.0 C, Case: 41.3 C,  Fan: 9 (tuned +0)
May 25 14:07:32 windtunnel kernel: CPU-temp: 59.8 C, Case: 41.2 C,  Fan: 8 (tuned -1)
May 25 14:07:40 windtunnel kernel: CPU-temp: 59.9 C, Case: 41.3 C,  Fan: 8 (tuned +0)
May 25 14:08:52 windtunnel kernel: CPU-temp: 60.1 C, Case: 41.5 C,  Fan: 9 (tuned +1)
May 25 14:09:00 windtunnel kernel: CPU-temp: 60.0 C, Case: 41.3 C,  Fan: 9 (tuned +0)

Expected Results:  no debug information should be output to dmesg

Additional info:

software-controlled fans are only available on certain PowerMacs
Comment 1 Dave Jones 2005-06-27 23:24:33 UTC 
Mass update of -test bugs to update version to fc4.
(Please retest on final release, and report results if you have not already done
so).

Thanks.
Comment 2 Lyonel Vincent 2005-06-28 12:09:40 UTC 
(In reply to comment #1)
> Mass update of -test bugs to update version to fc4.
> (Please retest on final release, and report results if you have not already done
> so).
> 
> Thanks.

this behaviour is unchanged in 2.6.11-1.1369_FC4smp

cheers.
Comment 3 Dave Jones 2005-07-15 21:41:11 UTC 
[This comment has been added as a mass update for all FC4 kernel bugs.
 If you have migrated this bug from an FC3 bug today, ignore this comment.]

Please retest your problem with todays 2.6.12-1.1398_FC4 update.

If your problem involved being unable to boot, or some hardware not being
detected correctly, please make sure your /etc/modprobe.conf is correct *BEFORE*
installing any kernel updates.
If in doubt, you can recreate this file using..

mv /etc/sysconfig/hwconf /etc/sysconfig/hwconf.bak
mv /etc/modprobe.conf /etc/modprobe.conf.bak
kudzu


Thank you.
Comment 4 Lyonel Vincent 2005-07-16 07:19:30 UTC 
The problem still exists:

$ uname -a
Linux windtunnel 2.6.12-1.1398_FC4smp #1 SMP Fri Jul 15 01:23:48 EDT 2005 ppc
ppc ppc GNU/Linux

$ sudo tail -f /var/log/messages
Jul 16 09:16:07 windtunnel kernel: CPU-temp: 58.3 C, Case: 43.0 C,  Fan: 4
(tuned +1)
Jul 16 09:16:23 windtunnel kernel: CPU-temp: 58.8 C, Case: 43.2 C,  Fan: 5
(tuned +1)
Jul 16 09:16:39 windtunnel kernel: CPU-temp: 59.5 C, Case: 43.5 C,  Fan: 6
(tuned +1)
Jul 16 09:16:47 windtunnel kernel: CPU-temp: 59.6 C, Case: 43.5 C,  Fan: 7
(tuned +1)
Jul 16 09:17:03 windtunnel kernel: CPU-temp: 60.0 C, Case: 43.7 C,  Fan: 8
(tuned +1)
Jul 16 09:17:11 windtunnel kernel: CPU-temp: 60.1 C, Case: 43.7 C,  Fan: 9
(tuned +1)
Comment 5 Lyonel Vincent 2005-07-16 07:36:16 UTC 
Created attachment 116834 [details]
patch to make fan adjustments appear only in KERN_DEBUG