Attachment 102785 Details for Bug 80901 – Hwmon email

Hwmon email

lm-sensors.nouveau.txt (text/plain), 1.32 KB, created by Invalid Invalid on 2014-07-14 16:49:20 UTC

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Creator: Invalid Invalid

Created: 2014-07-14 16:49:20 UTC

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patch

obsolete

>Hello guys,
>
>For a patch to this nouveau bug [1] I'm trying to implement the sysfs
>interface for two properties (linear_min and linear_max) nouveau uses
>internally to decide when to raise the fan speed. The initial idea was
>to have them as custom sysfs attributes, but I was advised to try to
>fit them into the hwmon sysfs interface.
>
>And this is when I hit a little roadblock. If my understanding is
>correct (and I'm not ashamed to admit it probably isn't) trip points
>are used to tie together a specific fan speed to a specific
>temperature. Unfortunately nouveau does not quite work that way: those
>two properties above mark the temperature the driver uses to decide
>when to start and stop the *scaling* of the fan speed (from a specific
>minimum value all the way to 100%).
>
>Now, could I strech the trip point definition above to mean that a
>trip point specify a *minimum* value for the fan speed at a specific
>temperature, and that the driver can decide to use an higher speed as
>needed when the temperature goes above the one specified in the trip
>point without fear of breaking some convention/userspace tool that
>expect a constant fan speed? Is this an acceptable/correct usage for
>the interface?
>
>Thanks,
>Gianni
>
>PS: please keep me in CC since I'm not subscribed to the list. Thank
>you.
>
>[1] https://bugs.freedesktop.org/show_bug.cgi?id=80901

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