kern/43543: ipmi(4) driver fails to collect Fan2 signal on Intel X38ML board

[Wolfgang.Stukenbrock%nagler-company.com@localhost]

>Number:         43543
>Category:       kern
>Synopsis:       ipmi(4) driver fails to collect Fan2 signal on Intel X38ML 
>board
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 29 17:10:00 +0000 2010
>Originator:     Wolfgang Stukenbrock
>Release:        NetBSD 5.0.2
>Organization:
Dr. Nagler & Company GmbH
        
>Environment:
        
        
System: NetBSD 5.0.2 (INSTALL) #2: Tue May 18 18:00:44 CEST 2010 
wgstuken@s012:/export/NetBSD-5.0.2/N+C-build/.OBJDIR_amd64/export/NetBSD-5.0.2/src/sys/arch/amd64/compile/INSTALL
 amd64
Architecture: x86_64
Machine: amd64
>Description:
        After booting the system reports soon that FAN-2 rotation speed is 
critical low.
        envstat(8) reports 0 RPM.

        But that is simply not true. The fan is working and I've switch FAN-3 
and FAN-2 hardware but the
        problem stays at FAN-2.
        When booting 4.0, a value other than 0 RPM is reported by envstat on 
the same board.
        So the problem is not at the hardware. For unknown reasons the 
ipmi-driver fails to collect
        the correct value for the FAN speed for FAN-2 on all of our boards in 
5.0.2 while 4.0 reports
        some values.

        Here the complete output of envstat(8) on the 5.0.2 system:

                       Current  CritMax  CritMin  CritCap     Unit
[coretemp0]
  cpu0 temperature:     40.000                                degC
[coretemp1]
  cpu1 temperature:     40.000                                degC
[ipmi0]
   P1 Therm Margin:    199.000                                degC
     Chassis Fan 3:       9906                                 RPM
     Chassis Fan 2:          0                                 RPM
     Chassis Fan 1:      11934                                 RPM
   BB Ambient Temp:     23.000                                degC
     Processor Vcc:      1.274                                   V
          BB +5.0V:      5.085                                   V
     BB +3.3V STBY:      3.255                                   V
          BB +3.3V:      3.286                                   V
       BB +1.8V SM:      1.793                                   V


        (remark: the value for P1 Term Margin look bad too, but the value 
reported under 4.0 is the same.
        The value for BB Ambient Temp looks good here - was bad (e.g. -105) in 
4.0 - see below.)


        The output of "envstat -r" on a 4.0 system with the same HW:

P1 Therm Margin:    198.000 degC
BB Ambient Temp:   -106.000 degC
  Chassis Fan 3:      11934 RPM
  Chassis Fan 2:       6942 RPM
  Chassis Fan 1:       4914 RPM
  Processor Vcc:      1.274 V
       BB +5.0V:      5.061 V
  BB +3.3V STBY:      3.223 V
       BB +3.3V:      3.286 V
    BB +1.8V SM:      1.803 V


        (remark: the large difference in RPM between all FAN's is suspect in 
4.0 too, but the values changes
        over time, so it looks at least like "real" values from some sensors 
...)

>How-To-Repeat:
        boot any 5.0.2 kernel ipmi configured on an X38ML board - it will fail 
to collect the RPM value
        for FAN2 on an X38ML board. Tested on more than on board where 4.0 
reports a (correct) value.
>Fix:
        not know up to now - sorry - no time to do additional debugging at the 
moment.
        If I can add some additional information without a lot of work, I will 
do it. Please ask for it.

>Unformatted: