[Bug 119211] New: amdgpu disables fan by default

[Bug 119211] New: amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

            Bug ID: 119211
           Summary: amdgpu disables fan by default
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.5.5
          Hardware: All
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: stsp@list.ru
        Regression: No

I have radeon R9 380.
After the KMS driver activates, the fans on
the GPU stops. They can be activated again by
properly setting up fancontrol, but this wasn't
configured on my PC. As the result, for the last
few years I have replaced many motherboards, all
starting to have bad capacitors around the video
card. But only now I have noticed that the fans
are not rotating... :(

The driver should activate fans by default, or
don't touch the initial settings (fans are rotating
before linux have started), but not stop them by default.

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #1 from Vedran Miletić <vedran@miletic.net> ---
You should produce some GPU load before the fan activates.

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #2 from Stas Sergeev <stsp@list.ru> ---
Even besides the fact that GPU was so hot I
couldn't even touch it?

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #3 from Stas Sergeev <stsp@list.ru> ---
Essentially, when driver initializes, it puts 0
to /sys/class/hwmon/hwmon0/pwm1. And unless you
set up fancontrol (which is a major pita), this
0 remain there, no matter how you load you GPU.
It should put some other value there, like 50 or
more. On my system 50 is a minimum value needed
to get the GPU fan rotating.

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #4 from Jimi <JimiJames.Bove@gmail.com> ---
Is this bug still happening? With my R9 Fury on amdgpu, cat
/sys/class/hwmon/hwmon0/pwm1 (well, in my case, it's hwmon2 because I have
another card), returns 35 on idle, not 0, but the fans are not running. Even
when I'm running a AAA game, my card doesn't even reach 40°C, so my cooling
system is too good for me to be able to actually see if the fans turn on when
they should. When I first started my computer up, pwm1 was giving me 56, but it
went down to 35 before I could finish opening my case and has stayed there no
matter what I do. When the card is bound to vfio-pci instead of amdgpu (for a
virtual machine), the fan is on all the time, even though the card's low idle
temperatures must be similar.

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #5 from Jimi <JimiJames.Bove@gmail.com> ---
I managed to check the fans while pwm1 was giving values like 68, 61, and 56,
and they were not turned on. I don't know if that means anything, because the
card was still <40 degrees and definitely not too hot to touch.

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #6 from Stas Sergeev <stsp@list.ru> ---
> Is this bug still happening?

For me it is happening as a hell.
And because fancontrol service also doesn't
work on my PC (I've filled another reports
about it), the problems are very real.

> I managed to check the fans while pwm1 was giving values like

You can write the values there, too.
In fact, I wonder who changes them for you.
Do you have the fancontrol set up and running?
$ systemctl status fancontrol

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #7 from Jimi <JimiJames.Bove@gmail.com> ---
I do not have fancontrol set up or running (it's inactive on my system). I
don't know anything about fancontrol at all. I'm running Arch Linux, so I
pretty much only am running services that I know about.

I tried writing values myself with echo, like 'echo 50 >
/sys/class/hwmon/hwmon0/pwm1', but that didn't affect it at all. Is that not
how you're supposed to change it?

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #8 from Alex Deucher <alexdeucher@gmail.com> ---
By default the hw controls the fan based on temperature, etc.

Not all cards have a fan control. If you do, then the following standard HWMON
pwm attributes should be available:

 * pwm1_enable: Current fan management mode (MANUAL or AUTO)
 * pwm1: Current PWM value (power percentage)
 * pwm1_min: The minimum PWM speed allowed
 * pwm1_max: The maximum PWM speed allowed (bypassed when hitting Fan_boost)

The fan can be driven in different modes:

 * 1: The fan can be driven in manual (use pwm1 to change the speed);
 * 2; The fan is driven automatically depending on the temperature.

See:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c#n644

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #9 from Stas Sergeev <stsp@list.ru> ---
(In reply to Alex Deucher from comment #8)
> By default the hw controls the fan based on temperature, etc.
For me not.

> Not all cards have a fan control. If you do, then the following standard
> HWMON
> pwm attributes should be available:
> 
>  * pwm1_enable: Current fan management mode (MANUAL or AUTO)
I have always '1' there.
Trying to write 0 or 2 there still leaves 1.
It simply doesn't change.

>  * pwm1: Current PWM value (power percentage)
Always 0, unless manually written.

> The fan can be driven in different modes:
> 
>  * 1: The fan can be driven in manual (use pwm1 to change the speed);
>  * 2; The fan is driven automatically depending on the temperature.
What should I write to pwm1_enable? '2'? It doesn't change.

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #10 from Alex Deucher <alexdeucher@gmail.com> ---
Please attach your dmesg output and xorg log (if running X).

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #11 from Stas Sergeev <stsp@list.ru> ---
Created attachment 228111
  --> https://bugzilla.kernel.org/attachment.cgi?id=228111&action=edit
dmesg

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[Bug 119211] amdgpu disables fan by default

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https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #12 from Stas Sergeev <stsp@list.ru> ---
Created attachment 228121
  --> https://bugzilla.kernel.org/attachment.cgi?id=228121&action=edit
Xorg log

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[Bug 119211] amdgpu disables fan by default

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #13 from Jimi <JimiJames.Bove@gmail.com> ---
That's interesting. My pwm1_enable returns 1, and trying to change it to 0 or 2
does nothing, but my pwm1 value does indeed change on its own, and I've never
seen it be 0. It sounds like I don't have this bug but do have some other less
major one? If pwm1 is changing on its own, can I trust that the fan will turn
on if my card ever gets too hot?

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[Bug 119211] amdgpu disables fan by default

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https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #14 from Jimi <JimiJames.Bove@gmail.com> ---
I should mention, my pwm1_min is 0 and pwm1_max is 255.

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[Bug 119211] amdgpu disables fan by default

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https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #15 from Stas Sergeev <stsp@list.ru> ---
> I should mention, my pwm1_min is 0 and pwm1_max is 255.

Same here.
IMHO pwm1_min should contain the value that
keeps the fan rotating at a minimal safe speed.
Putting 0 there makes it entirely useless.

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[Bug 119211] amdgpu disables fan by default

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https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #16 from Jimi <JimiJames.Bove@gmail.com> ---
Not necessarily. Less fans means less power usage means money saved, and as we
can see with my computer, you can keep the card cool without its own fans. I
have 4 case fans that are plugged directly into power and so are less competent
at knowing when to turn off. Something needs to be done about your fan not
activating when it should, though.

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[Bug 119211] amdgpu disables fan by default

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https://bugzilla.kernel.org/show_bug.cgi?id=119211

--- Comment #17 from Stas Sergeev <stsp@list.ru> ---
> Not necessarily. Less fans means less power usage means money saved

You can set up fancontrol or put 0 into pwm1 manually
to stop the fan. But putting 0 into pwm1_min is IMHO
quite useless, it can as well just not exist at all.
But if it will contain the minimum _safe_ value, then
that can well be used.
Currently fancontrol have to "evaluate" the minimal
safe value by hands. It lowers the pwm1 value and looks
when the fan have stopped by checking the value of
fan1_input if that exists. And it doesn't exist for
amdgpu, so you need to do such a probe by hands.

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[Bug 119211] amdgpu disables fan by default

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https://bugzilla.kernel.org/show_bug.cgi?id=119211

Stas Sergeev (stsp2@yandex.ru) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|4.5.5                       |6.7.7

--- Comment #18 from Stas Sergeev (stsp2@yandex.ru) ---
I figured out something very interesting
regarding this bug.

Writing 2 to pwm1_enable causes the
fan to rotate for about 10 seconds.
Note that the old value of pwm1_enable
is also 2, so it doesn't change, but
the mere fact of writing has an effect!

And this is not all!
Now if you periodically READ from pwm1,
then the fan doesn't stop! I can do:
while :; do cat /sys/class/hwmon/hwmon0/pwm1; sleep 1; done
And with this, the fan keeps rotating
forever! But if you stop that script
for something like 10 seconds, then
the fan stops and pwm1 reads always
return 0. You need to start again by
writing 2 to pwm1_enable (even if there
is already 2!), and quickly start reading
from pwm1, and you have your fan finally
rotating. :)
A bit of a hand-written fancontrol script. :)

Alex Deucher can you make any sense
out of that?

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