[Nouveau] [Bug 78106] New: Reported fan rpm is twice the actual value (NVC0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78106

          Priority: medium
            Bug ID: 78106
          Assignee: nouveau at lists.freedesktop.org
           Summary: Reported fan rpm is twice the actual value (NVC0)
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mdop at seznam.cz
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 98224
  --> https://bugs.freedesktop.org/attachment.cgi?id=98224&action=edit
Kernel log

I have Gigabyte GTX 560 Ti Ultra Durable (01:00.0 VGA compatible controller:
NVIDIA Corporation GF114 [GeForce GTX 560 Ti] (rev a1)) and Nouveau doesn't
report correct fan speed. Reported value is exactly twice the actual speed. 

$ pacman -Q | grep nouveau
nouveau-dri 10.1.1-2
xf86-video-nouveau 1.0.10-2
$ sensors
...
nouveau-pci-0100
Adapter: PCI adapter
fan1:        6840 RPM
temp1:        +31.0°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)
...

When I follow Documentation/thermal/nouveau_thermal and the speed to 100%,
nouveau reports "fan1: 6840 RPM" while the highest reported RPM by Windows
(both Gigabyte tools and CPU-Z) is 3390 or 3420 RPM. Similar to when I set the
lowest speed (I have modified bios and my pwm1_min is 30) nouveau reports
"fan1: 3180 RPM" while Windows shows 1560 or 1590 RPM.
Could that be because the card has two physical fans? Reporting the speed of
single fan would make more sense IMHO.

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