[Nouveau] [Bug 107325] New: Reported temperature of nvidia card with nouveau driver is wrong

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107325

            Bug ID: 107325
           Summary: Reported temperature of nvidia card with nouveau
                    driver is wrong
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: j.novak at netsystem.cz
        QA Contact: xorg-team at lists.x.org

Hello,

  I use Dell Precision 3530 with NVIDIA Corporation GP107GLM [Quadro P600
Mobile] (rev a1). I use Fedora Core 28 with 4.17.6 x86_64 kernel.
  I found that sensors tool shows wrong temperature:

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:       +511.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

  Temperature is obviously wrong.
  I tried to troubleshoot it on sensors side and it looks that sensors tool
receives this wrong value from driver.
  I made one more observation - right after suspend/wakeup the value is
completely different:

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:       +511.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:        +43.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:       +511.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

  I can provide more information when required.

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