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Usually gap caused by bad sensor in lm_sensors.
To solve problem you need ignore bad sensor in sensors config.
Something like create file /etc/sensors.d/i8k
chip "i8k-virtual-0"
ignore fan1
Errors like ERROR: Can't get value of subfeature temp1_input: I/O error can be caused by bad sensor in lm_sensors.
To solve problem you need ignore bad sensor in sensors config.
Something like create file /etc/sensors.d/iwlwifi
chip "iwlwifi-virtual-0"
ignore temp1
The file must also be readable for all, so check file permissions, and if necessary:
chmod a+r /etc/sensors.d/iwlwifi
You need to enable S.M.A.R.T. in BIOS
Sensors can be renamed by modifying the file /etc/sensors3.conf or preferably in a seperate file, such as /etc/sensors.d/custom.conf (see this comment).
First you need to identify the "raw" sensor name. This is achieved by running the command sensors -u. Below is an example of the output.
>> sensors -u
nct6791-isa-0290
Adapter: ISA adapter
AUXTIN2:
temp5_input: 26.000
temp5_type: 4.000
temp5_offset: 0.000
The above specifies that the sensor temp5 is labeled AUXTIN2. If we want to rename this, we write to /etc/sensors.d/custom.conf:
chip "nct6791-isa-0290"
label temp4 "My New Label"
Note: that _input is not included in the raw sensors name.
Save the file, and Freon should update it's label automatically.
Perform the same actions as described above, but instead of label use ignore:
chip "nct6791-isa-0290"
ignore temp4
Sensors can be selected to display the value in the top bar. Previously selected sensors which don't exist anymore in the system appear as "⚠" in the top bar.
Since it's not possible to deselect the missing sensor, one is apparently stuck with the warning sign.
Selecting one of the available sensors re-checks the configuration and the warning sign is gone.