[Bug 202019] New: amdgpu: fan speed reported incorrectly when the fan is off

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=202019

            Bug ID: 202019
           Summary: amdgpu: fan speed reported incorrectly when the fan is
                    off
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.20-rc7
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mezin.alexander at gmail.com
        Regression: No

I have a card with semi-passive cooling (Sapphire RX Vega 64 Nitro+)
When the fan turns off, non-zero speed is still reported through hwmon
fan1_input.
If I'm not mistaken, the same problem was present with my previous card -
Sapphire RX 580 Pulse (so I guess it's the same for all cards).

On Windows zero rpm was correctly reported for both cards, of course.

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