Hi Guest68, I just got your email.
Sorry, I never got a chance to create an issue. I got distracted with trying to learn how the EC works and maybe fix it myself, and then forgot about it all together.
I did however start writing a draft in my notes app if it helps:
Hi, the sensor cpu@4c seems to intermittently return EC_TEMP_SENSOR_ERROR (0xfe). The same sensor using ACPI also returns 180.8°C while this is happening, which seems very wrong.
It seems to occur more frequently while unplugged from the charger, but it can occur while charging.
I’m not too experienced with the CrOS EC codebase, but can’t find anything obvious in the code that would cause it. So I’m hoping it’s not a interference/hardware issue, but I wouldn’t be surprised if it is.
This also seems to occur for @t-8ch while discussing a Linux hwmon driver.
Command Outputs:
sensors acpitz-acpi-0
acpitz-acpi-0
Adapter: ACPI interface
local_f75303@4d: +32.8°C
cpu_f75303@4d: +32.8°C
ddr_f75303@4d: +30.8°C
cpu@4c: +180.8°C
ectool temps all
--sensor name -------- temperature -------- fan speed --
local_f75303@4d 307 K (= 34 C) 0%
cpu_f75303@4d 306 K (= 33 C) 0%
ddr_f75303@4d 304 K (= 31 C) -1%
Sensor 3 error
A Python script using my CrOS_EC_Python.
Temp Sensor 0: 308K (35°C)
Temp Sensor 1: 308K (35°C)
Temp Sensor 2: 306K (33°C)
Temp Sensor 3: Error 0xfe