Red Hat Bugzilla – Bug 139878
system hard locks when lm_sensors is started
Last modified: 2015-03-04 20:14:35 EST
Description of problem: When 'sensors -s' is run, system hard locks (i.e. requires power cycling to reset) IF lm85 is present AND cpu core temperature is >50C. This can be avoided if the lm85 section in sensors.conf has the: set temp1_max set temp2_max parameters set to something above the current CPU temp (in my case, I changed them both to 70C). Version-Release number of selected component (if applicable): lm_sensors-2.8.7-2 How reproducible: Always Steps to Reproduce: 1. install FC3 on a machine with an lm85 sensor chip 2. run sensors-detect 3. wait until CPU core temperature is above 50C 4. start lm_sensors Additional info: This bug was noticed on a Dell Pentium 4 (with typically terrible OEM cooling) where the CPU temperature routinely hits 68C with 100% CPU usage. With all the hot running Prescott cored CPUs in wide use today, perhaps changing the default value of temp1_max and temp2_max (at least for sensor chips commonly used on P4s) to something higher might be in order?
The current lm_sensors-2.9.1 which is in devel has 65C resp. 70C for temp1_max resp. temp2_max for that chipset and i'd rather not deviate from these obviously recommended values. Read ya, Phil