Bug 110641

Summary:	lm_sensors reports "ERROR: Can't get value of subfeature in0_input: Can't read"
Product:	DRI	Reporter:	Bong Cosca <bong.cosca>
Component:	DRM/AMDgpu	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED MOVED	QA Contact:
Severity:	normal
Priority:	medium
Version:	XOrg git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Bong Cosca 2019-05-08 07:28:04 UTC

Alex Deucher <alexander.deucher@amd.com> 2017-03-08 18:25:15 -0500
drm/amdgpu: expose GPU sensor related information
commit 5ebbac4b5c9159130046bf7c56b7f4c71ca7d1b7

This particular commit introduced this error.

$ sensors -j

{
   "amdgpu-pci-0008":{
      "Adapter": "PCI adapter",
      "vddgfx":{
ERROR: Can't get value of subfeature in0_input: Can't read

      },
      "vddnb":{
ERROR: Can't get value of subfeature in1_input: Can't read

      },
      "temp1":{
         "temp1_input": 12.000,
         "temp1_crit": 120.000,
         "temp1_crit_hyst": 90.000
      }
   },
   "it8603-isa-0290":{
      "Adapter": "ISA adapter",
      "CPU Fan":{
         "fan1_input": 2509.000,
         "fan1_min": 200.000,
         "fan1_alarm": 0.000
      },
      "Mobo Fan":{
         "fan2_input": 0.000,
         "fan2_min": 600.000,
         "fan2_alarm": 1.000
      },
      "AMD A6-7400K Radeon R5":{
         "temp1_input": 44.000,
         "temp1_max": 127.000,
         "temp1_min": -45.000,
         "temp1_alarm": 0.000,
         "temp1_type": 4.000,
         "temp1_offset": 0.000
      },
      "Asus A68HM-K Mobo":{
         "temp2_input": 45.000,
         "temp2_max": -33.000,
         "temp2_min": 53.000,
         "temp2_alarm": 1.000,
         "temp2_type": 4.000,
         "temp2_offset": 0.000
      }
   }
}

Comment 1 Alex Deucher 2019-05-08 15:42:06 UTC

That commit just exposes the temperature via an ioctl interface.  It doesn't affect the hwmon sysfs API.  How did you determine that that was the problematic one?

Comment 2 Bong Cosca 2019-05-08 21:58:28 UTC

It wasn't the case before when VDDGFX and VDDNB were not exposed. Are these (and the missing in0_input/in1_input probes) present on APUs?

Comment 3 Alex Deucher 2019-05-09 02:15:26 UTC

What chip do you have?  Voltage hwmon is not implemented on all APUs.

Comment 4 Bong Cosca 2019-05-09 03:40:57 UTC

AMD A6-7400K Radeon R5

Comment 5 Alex Deucher 2019-05-09 03:51:25 UTC

(In reply to Bong Cosca from comment #4)
> AMD A6-7400K Radeon R5

No hwmon support for voltage on that family.

Comment 6 Bong Cosca 2019-05-09 05:17:07 UTC

So does it make sense to expose VDDGFX and VDDNB at all? Or should this be fixed in lm_sensors?

Comment 7 Martin Peres 2019-11-19 09:25:32 UTC

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