I have same problem and ipmitool -c sdr report me
+5VSB,5.100,Volts,ok
+3VSB,3.520,Volts,ok
Vcore,0.820,Volts,ok
VCCM,1.360,Volts,ok
+1.1V,1.080,Volts,ok
+1.0V,1.030,Volts,ok
BAT,3.180,Volts,ok
+3V,3.360,Volts,ok
+5V,5.070,Volts,ok
+12V,12.100,Volts,ok
CPU_FAN1,1400,RPM,ok
REAR_FAN1,,,ns
FRNT_FAN1,,,ns
FRNT_FAN2,,,ns
REAR_FAN2,800,RPM,ok
CPU_FAN2,,,ns
MB Temperature,43,degrees C,ok
CPU Temperature,42,degrees C,ok
nothing weird in the syslog