[Bug 199979] New: amdgpu: changing pwm1_enable from 1 to 2 does not resume automatic fan control

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199979

            Bug ID: 199979
           Summary: amdgpu: changing pwm1_enable from 1 to 2 does not
                    resume automatic fan control
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.17.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: CWidmer@umbrox.de
        Regression: No

When using the hardware monitoring interface to change pwm1_enable to 2
(automatic) from 1 (manual), the automatic fan control does not work as
expected. Instead, the pwm1 value keeps jumping around between at least two
values and a continuous, persisting, and unpleasantly high-pitched sound can be
heard from inside the computer case. The only way to stop those things is
writing some valid value to pwm1, which in turn also switches pwm1_enable back
to 1. If the system is booted without ever manually changing the pwm1_enable
value, which then defaults to 2, automatic fan control does work as intended.

I am using a custom RX 580 (Sapphire Nitro+ Radeon RX 580 8GD5 Special Edition)
on a Gentoo x86_64 system and was able to reproduce the issue with the 4.17.0
kernel with Gentoo patches, the Ubuntu kernel on the 18.04 image (should be a
4.15 one) and also with amd-staging-drm-next.

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