[Bug 212107] Temperature increase by 15°C on radeon gpu

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https://bugzilla.kernel.org/show_bug.cgi?id=212107

--- Comment #8 from Martin (martin.tk@xxxxxxx) ---
(In reply to Dieter Nützel from comment #7)
> Addendum (@Alex)
> Maybe we could do someting about the reported fan speed.
> Zero (0) if stopped.
> 
> @Martin
> You can verify the fan speed (raise) if you put load on your gfx card.

I've just rebooted into 5.11.5. The gpu fan went into max speed for one second
or so. After the computer finished booting sensors still showed over 3000rpm,
even though at that point the fan was already off:

amdgpu-pci-0100
Adapter: PCI adapter
vddgfx:      825.00 mV
fan1:        3601 RPM  (min =    0 RPM, max = 3500 RPM)
edge:         +47.0°C  (crit = +97.0°C, hyst = -273.1°C)
power1:        7.15 W  (cap =  36.00 W)

I waited a couple of minutes and then watched 4k vid. The fan turned on and
sensors started showing this:

amdgpu-pci-0100
Adapter: PCI adapter
vddgfx:      962.00 mV
fan1:        1004 RPM  (min =    0 RPM, max = 3500 RPM)
edge:         +57.0°C  (crit = +97.0°C, hyst = -273.1°C)
power1:       12.03 W  (cap =  36.00 W)


So there is a change in reported fan speed. After turning of the video the fan
turned off again but the reported fan speed stayed at roughly 900 RPM.

I played a bit of Xonotic. Again, fan turned on but the reported fan speed
remained roughly the same, around 900 RPM.

I have no way of measuring the actual fan speed while playing a game or
watching a video so I don't know if what sensors are reporting is accurate.

sensors --version outputs the following:

sensors version 3.6.0 with libsensors version 3.6.0

For the CPU fan speed it does seem to report the actual speed. I've recently
switched to a new CPU cooler with a new fan and both this new one and the old
one were reporting speed change that corresponded to actual cpu fan speed. The
old cooler had manual fan control so I could see the reported speed change
live.



ps. I'm in UTC+1 and I probably won't be able to post more tonight.

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