pyamsoft
commented
7 years ago In the file /sys/class/thermald/cooling_device<whatever number powerclamp is> the actual file max_state shows that it is a read only file. This suggests that the max_state is decided by the system, and is out of the control of thermald.
pyamsoft /sys/class/thermal/cooling_device15 $ ls -l
total 0
-rw-r--r-- 1 root root 4.0K Oct 19 18:54 cur_state
-r--r--r-- 1 root root 4.0K Oct 19 18:52 max_state
drwxr-xr-x 2 root root 0 Oct 19 18:53 power
lrwxrwxrwx 1 root root 0 Oct 19 18:52 subsystem -> ../../../../class/thermal
-r--r--r-- 1 root root 4.0K Oct 19 18:52 type
-rw-r--r-- 1 root root 4.0K Oct 19 18:52 uevent
sassmann
Limiting intel_powerclamp to say 20% doesn't work.
thermald --no-daemon --loglevel=info [...] Dumping parsed XML Data * Index 0 * Name: GenericX86LaptopDevice UUID: type: 0 Zone 0 Name: cpu Trip Point 0 temp 75000 trip type 1 hyst id 0 sensor type Cooling Dev 0 Type: rapl_controller Path: Min: 0 Max: 0 Step: 1 AutoDownControl: 0 Cooling Dev 1 Type: intel_powerclamp Path: Min: 0 Max: 20 Step: 5 AutoDownControl: 0 [...] Set : threshold:73500, temperature:75000, cdev:8(intel_powerclamp), curr_state:5, max_state:50 cdev index:8 consecutive call, increment exponentially state 15 Set : threshold:73500, temperature:76000, cdev:8(intel_powerclamp), curr_state:15, max_state:50 cdev index:8 consecutive call, increment exponentially state 25 Set : threshold:73500, temperature:74000, cdev:8(intel_powerclamp), curr_state:25, max_state:50 Set : threshold:73500, temperature:72000, cdev:8(intel_powerclamp), curr_state:20, max_state:50 Set : threshold:73500, temperature:72000, cdev:8(intel_powerclamp), curr_state:15, max_state:50 Set : threshold:73500, temperature:74000, cdev:8(intel_powerclamp), curr_state:20, max_state:50 cdev index:8 consecutive call, increment exponentially state 30 Set : threshold:73500, temperature:75000, cdev:8(intel_powerclamp), curr_state:30, max_state:50
thermald clearly exceeds the specified max_state of 20