Trying to read unavailable sensor tempretures

[darthbanana13]

When I start glances on my Dell 9550 it gives me the following error:

Traceback (most recent call last):
  File "/usr/local/bin/glances", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.5/dist-packages/glances/__init__.py", line 225, in main
    start_standalone(config=config, args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/__init__.py", line 105, in start_standalone
    standalone = GlancesStandalone(config=config, args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/standalone.py", line 43, in __init__
    self.stats = GlancesStats(config=config, args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/stats.py",line 43, in __init__
    self.load_modules(self.args)
  File "/usr/local/lib/python3.5/dist-packages/glances/stats.py",line 77, in load_modules
    self.load_plugins(args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/stats.py",line 105, in load_plugins
    self._plugins[plugin_name] = plugin.Plugin(args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/plugins/glances_sensors.py", line 53, in __init__
    self.glancesgrabsensors = GlancesGrabSensors()
  File "/usr/local/lib/python3.5/dist-packages/glances/plugins/glances_sensors.py", line 229, in __init__
    self.stemps = psutil.sensors_temperatures()
  File "/usr/local/lib/python3.5/dist-packages/psutil/__init__.py", line 2212, in sensors_temperatures
    rawdict = _psplatform.sensors_temperatures()
  File "/usr/local/lib/python3.5/dist-packages/psutil/_pslinux.py", line 1110, in sensors_temperatures
    current = float(cat(base + '_input')) / 1000.0
  File "/usr/local/lib/python3.5/dist-packages/psutil/_pslinux.py", line 299, in cat
    return f.read().strip()
OSError: [Errno 19] No such device

I have tried versions of psutil from 2.0 up to 5.2 and it would start crashing from 5.1 (including). Although in 5.1 the error would be different (from the battery status):

Traceback (most recent call last):
  File "/usr/local/bin/glances", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.5/dist-packages/glances/__init__.py", line 225, in main
    start_standalone(config=config, args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/__init__.py", line 105, in start_standalone
    standalone = GlancesStandalone(config=config, args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/standalone.py", line 43, in __init__
    self.stats = GlancesStats(config=config, args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/stats.py", line 43, in __init__
    self.load_modules(self.args)
  File "/usr/local/lib/python3.5/dist-packages/glances/stats.py", line 77, in load_modules
    self.load_plugins(args=args)
  File "/usr/local/lib/python3.5/dist-packages/glances/stats.py", line 96, in load_plugins
    plugin = __import__(os.path.basename(item)[:-3])
  File "/usr/local/lib/python3.5/dist-packages/glances/plugins/glances_sensors.py", line 26, in <module>
    from glances.plugins.glances_batpercent import Plugin as BatPercentPlugin
  File "/usr/local/lib/python3.5/dist-packages/glances/plugins/glances_batpercent.py", line 38, in <module>
    psutil.sensors_battery()
  File "/usr/local/lib/python3.5/dist-packages/psutil/__init__.py", line 2246, in sensors_battery
    return _psplatform.sensors_battery()
  File "/usr/local/lib/python3.5/dist-packages/psutil/_pslinux.py", line 1112, in sensors_battery
    energy_now = int(cat(root + "/energy_now"))
  File "/usr/local/lib/python3.5/dist-packages/psutil/_pslinux.py", line 288, in cat
    f = open_binary(fname) if binary else open_text(fname)
  File "/usr/local/lib/python3.5/dist-packages/psutil/_pslinux.py", line 187, in open_binary
    return open(fname, "rb", **kwargs)
FileNotFoundError: [Errno 2] No such file or directory: '/sys/class/power_supply/BAT0/energy_now'

but i think this is related to another issue. From 5.1.1 the error would look the same. This is the output of sensors in my terminal:

~  sensors
coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +34.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:         +31.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:         +32.0°C  (high = +100.0°C, crit = +100.0°C)
Core 2:         +30.0°C  (high = +100.0°C, crit = +100.0°C)
Core 3:         +32.0°C  (high = +100.0°C, crit = +100.0°C)

acpitz-virtual-0
Adapter: Virtual device
temp1:        +25.0°C  (crit = +107.0°C)

iwlwifi-virtual-0
Adapter: Virtual device
temp1:        +31.0°C

nouveau-pci-0100
Adapter: PCI adapter
GPU core:     +0.60 V  (min =  +0.60 V, max =  +1.20 V)
temp1:            N/A  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

Update:

Can confirm it is no longer a problem after installing the proprietary nvidia driver because lm-sensors can't find any nvidia thermal sensors. So basically this is a problem for Optimus laptops that use nouveau.