[Nouveau] [Bug 78116] New: Auto fan speed management doesn't do anything in non critical temperature range (NVC0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78116

          Priority: medium
            Bug ID: 78116
          Assignee: nouveau at lists.freedesktop.org
           Summary: Auto fan speed management doesn't do anything in non
                    critical temperature range (NVC0)
        QA Contact: xorg-team at lists.x.org
          Severity: enhancement
    Classification: Unclassified
                OS: All
          Reporter: mdop at seznam.cz
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

I have Gigabyte GTX 560 Ti Ultra Durable card. (Logs for this issue are same as
in Bug 78106)

1a) When I finish booting, nouveau selects AUTO mode (pwm1_enable: 2) and set's
the fan power to 55% (pwm1: 55).

1b) Enable manual mode, set pwm1 to 100, enable auto mode.

In both cases I would expect from the AUTO mode to lower PWM to go as low as
pwm1_min if the temperature is low enough. My card temperature is 31-33 °C but
pwm1 is never lowered in AUTO mode (neither from 55 or 100).

2) On Windows pwm goes as low as pwm1_min (which is 40 by default for GTX 560
Ti but it also works with my modded value of 30). I thought that Nvidia card
can manage it by itself (is it really done by operating system/software?).

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