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

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

[bugzilla-daemon]

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@kernel-bugs.osdl.org
          Reporter: mezin.alexander@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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[Bug 202019] amdgpu: fan speed reported incorrectly when the fan is off

[bugzilla-daemon]

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

Felix Schwarz (felix.schwarz@oss.schwarz.eu) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |felix.schwarz@oss.schwarz.e
                   |                            |u

--- Comment #1 from Felix Schwarz (felix.schwarz@oss.schwarz.eu) ---
Probably a silly question but still: Did you confirm (visually) that the fans
are actually turned off? AFAIK on Windows there is extra software running which
turns of the fans when the GPU temperature is below a certain threshold. IIRC
you need third-party scripts to achieve the same.

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

[bugzilla-daemon]

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

--- Comment #2 from Felix Schwarz (felix.schwarz@oss.schwarz.eu) ---
Oh and probably AMD developers would like to know which kernel version you are
using.

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

[bugzilla-daemon]

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

Aleksandr Mezin (mezin.alexander@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |low

--- Comment #3 from Aleksandr Mezin (mezin.alexander@gmail.com) ---
(In reply to Felix Schwarz from comment #1)
> Probably a silly question but still: Did you confirm (visually) that the
> fans are actually turned off? 

Yes

> AFAIK on Windows there is extra software
> running which turns of the fans when the GPU temperature is below a certain
> threshold. IIRC you need third-party scripts to achieve the same.

On Windows I have no additional software, only AMD driver (downloaded from
amd.com, not modded by Sapphire or anything).

Actually, I have my own script that controls fans on Linux (because there's no
sysfs knobs to tweak the "automatic" fan curve), it just checks the temperature
every second and writes desired fan speed to hwmon/pwm1. I tried to manually
write '0' to pwm1 (with pwm1_enable set to '1') - exactly the same bug -
fan1_input stops changing (when the fan is actually spinning, fan speed is
always slightly changing, +/- few rpms), but doesn't show "0" (and, again, the
fans are actually stopped)

This problem occurs with both "pwm1_enable=2" and "pwm1_enable=1, pwm1=0"

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

[bugzilla-daemon]

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

--- Comment #4 from Aleksandr Mezin (mezin.alexander@gmail.com) ---
(In reply to Felix Schwarz from comment #2)
> Oh and probably AMD developers would like to know which kernel version you
> are using.

It's here, in "Kernel Version" field in bugzilla. 4.20-rc7

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