[ltp] Re: pwm controls in /sys

[Bill Hudacek]

<font size=3D2 face=3D"sans-serif">Behavior is consistent, but his results
and mine don't agree. &nbsp;I get about 4,800 RPM with </font><tt><font siz=
e=3D2>pwm1=5Fenable
</font></tt><font size=3D2 face=3D"sans-serif">set to 0. It's very loud.</f=
ont>
<br>
<br><font size=3D2 face=3D"sans-serif">I have a w500, so this may be apples
and oranges. &nbsp;If not, I'd be looking at a hardware problem with those
numbers.</font>
<br>
<br><font size=3D2 face=3D"sans-serif">/Bill</font>
<br>
<br>
<br>
<br><font size=3D1 color=3D#5f5f5f face=3D"sans-serif">From: &nbsp; &nbsp; =
&nbsp;
&nbsp;</font><font size=3D1 face=3D"sans-serif">Bj=F8rn Mork &lt;bjorn@mork=
.no&gt;</font>
<br><font size=3D1 color=3D#5f5f5f face=3D"sans-serif">To: &nbsp; &nbsp; &n=
bsp;
&nbsp;</font><font size=3D1 face=3D"sans-serif">linux-thinkpad@linux-thinkp=
ad.org</font>
<br><font size=3D1 color=3D#5f5f5f face=3D"sans-serif">Date: &nbsp; &nbsp; =
&nbsp;
&nbsp;</font><font size=3D1 face=3D"sans-serif">2013-04-28 12.32</font>
<br><font size=3D1 color=3D#5f5f5f face=3D"sans-serif">Subject: &nbsp; &nbs=
p;
&nbsp; &nbsp;</font><font size=3D1 face=3D"sans-serif">Re: [ltp] Re:
pwm controls in /sys</font>
<br><font size=3D1 color=3D#5f5f5f face=3D"sans-serif">Sent by: &nbsp; &nbs=
p;
&nbsp; &nbsp;</font><font size=3D1 face=3D"sans-serif">linux-thinkpad-admin=
@linux-thinkpad.org</font>
<br>
<hr noshade>
<br>
<br>
<br><tt><font size=3D2>Dave Cunningham &lt;sparkprime@gmail.com&gt; writes:=
<br>
<br>
&gt; Did some more experimentation -- this is how it seems to behave:<br>
&gt;<br>
&gt; pwm1=5Fenable =3D=3D 0<br>
&gt; fan speed: 3800rpm<br>
&gt;<br>
&gt; pwm1=5Fenable =3D=3D 1<br>
&gt; fan speed: 3100rpm to 0 depending on value in pwm (255 to 0)<br>
&gt;<br>
&gt; pwm1=5Fenable =3D=3D 2<br>
&gt; fan speed varies automatically according to temperature, but is never
above<br>
&gt; 3100<br>
<br>
This is consistent with the docs. &nbsp;You can find an online version
here:<br>
</font></tt><a href=3D"https://www.kernel.org/doc/Documentation/hwmon/sysfs=
-interface"><tt><font size=3D2>https://www.kernel.org/doc/Documentation/hwm=
on/sysfs-interface</font></tt></a><tt><font size=3D2><br>
<br>
<br>
Bj=F8rn<br>
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