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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Fan speed in idle at 40% with radeonsi and at 18% with catalyst"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73338#c59">Comment # 59</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Fan speed in idle at 40% with radeonsi and at 18% with catalyst"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73338">bug 73338</a>
from <span class="vcard"><a class="email" href="mailto:alexdeucher@gmail.com" title="Alex Deucher <alexdeucher@gmail.com>"> <span class="fn">Alex Deucher</span></a>
</span></b>
<pre>(In reply to Chernovsky Oleg from <a href="show_bug.cgi?id=73338#c58">comment #58</a>)
<span class="quote">> Can you elaborate on what each bit of this control register means? Maybe I
> just can't into abbreviations :)</span >
TMIN - temp at which the fan would be turned on
FDO_PWM_MODE - which PWM mode to use:
0 - static PWM based on fuse value
1 - static PWM based on CG_FDO_CTRL0.FDO_STATIC_DUTY value
2 - dynamic PWM
5 - static PWM based on RPM CG_TACH_CTRL.TARGET_PERIOD value
TACH_PWM_RESP_RATE - amount to adjust PWM in tach mode
As far as I know, only values 1 and 5 are used for FDO_PWM_MODE in the driver
for manual control. I'm not sure what dynamic PWM (2) means or how it works.
It might be used by the smc for fan control.
I also noticed a minor error in the RPM control setup, and I've pushed a patch
to my 3.19-wip branch.</pre>
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