[ltp] Re: pwm controls in /sys
Dave Cunningham
linux-thinkpad@linux-thinkpad.org
Tue, 30 Apr 2013 00:10:55 -0400
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Thanks for the help guys.
I bought some Arctic Silver, replaced the old thermal glue on the cpu,
chipset, and heatpipe, and rebuilt it -- it didn't make much difference I
think. I tried both a very thin layer and a slightly thicker layer as
well. Maybe a slight improvement but I still have to be very careful with
cpu utilisation to avoid reboots. This laptop has been through hell and is
nearly 4 years old so quite likely the original thermal compound was not
working as well as it should.
I also tried blowing out the dust -- there actually wasn't that much. The
airflow can be easily felt around the grilles. The heatsink doesn't seem
that hot either, certainly not anywhere near the temperature reported by
the core2duo.
It seems like either the heatpipe has a problem (unlikely) or the fan isn't
going fast enough. It doesn't matter which since the replacement part is a
heatpipe/heatsink/fan combo unit and I've got a cheap one on order from
Hong Kong now. This probably not the best source of spare parts but I
guess this laptop isn't going to last a whole lot longer now... :)
On Sun, Apr 28, 2013 at 3:42 PM, Bill Hudacek <hudacek@us.ibm.com> wrote:
> Behavior is consistent, but his results and mine don't agree. I get abou=
t
> 4,800 RPM with pwm1_enable set to 0. It's very loud.
>
> I have a w500, so this may be apples and oranges. If not, I'd be looking
> at a hardware problem with those numbers.
>
> /Bill
>
>
>
> From: Bj=F8rn Mork <bjorn@mork .no>
> To: linux-thinkpad@linux-thinkpad.org
> Date: 2013-04-28 12.32
> Subject: Re: [ltp] Re: pwm controls in /sys
> Sent by: linux-thinkpad-admin@linux-thinkpad.org
> ------------------------------
>
>
>
> Dave Cunningham <sparkprime@gmail.com> writes:
>
> > Did some more experimentation -- this is how it seems to behave:
> >
> > pwm1_enable =3D=3D 0
> > fan speed: 3800rpm
> >
> > pwm1_enable =3D=3D 1
> > fan speed: 3100rpm to 0 depending on value in pwm (255 to 0)
> >
> > pwm1_enable =3D=3D 2
> > fan speed varies automatically according to temperature, but is never
> above
> > 3100
>
> This is consistent with the docs. You can find an online version here:
> https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface
>
>
> Bj=F8rn
> --
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>
>
> -- The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>
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<div dir=3D"ltr">Thanks for the help guys.<div><br></div><div style>I bough=
t some Arctic Silver, replaced the old thermal glue on the cpu, chipset, an=
d heatpipe, and rebuilt it -- it didn't make much difference I think. =
=A0I tried both a very thin layer and a slightly thicker layer as well. =A0=
Maybe a slight improvement but I still have to be very careful with cpu uti=
lisation to avoid reboots. =A0This laptop has been through hell and is near=
ly 4 years old so quite likely the original thermal compound was not workin=
g as well as it should.</div>
<div style><br></div><div style>I also tried blowing out the dust -- there =
actually wasn't that much. =A0The airflow can be easily felt around the=
grilles. =A0The heatsink doesn't seem that hot either, certainly not a=
nywhere near the temperature reported by the core2duo.</div>
<div style><br></div><div style>It seems like either the heatpipe has a pro=
blem (unlikely) or the fan isn't going fast enough. =A0It doesn't m=
atter which since the replacement part is a heatpipe/heatsink/fan combo uni=
t and I've got a cheap one on order from Hong Kong now. =A0This probabl=
y not the best source of spare parts but I guess this laptop isn't goin=
g to last a whole lot longer now... :)</div>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Sun,=
Apr 28, 2013 at 3:42 PM, Bill Hudacek <span dir=3D"ltr"><<a href=3D"mai=
lto:hudacek@us.ibm.com" target=3D"_blank">hudacek@us.ibm.com</a>></span>=
wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><font face=3D"sans-serif">Behavior is consis=
tent, but his results
and mine don't agree. =A0I get about 4,800 RPM with </font><tt><font>pw=
m1_enable
</font></tt><font face=3D"sans-serif">set to 0. It's very loud.</font>
<br>
<br><font face=3D"sans-serif">I have a w500, so this may be apples
and oranges. =A0If not, I'd be looking at a hardware problem with those
numbers.</font>
<br>
<br><font face=3D"sans-serif">/Bill</font>
<br>
<br>
<br>
<br><font size=3D"1" color=3D"#5f5f5f" face=3D"sans-serif">From: =A0 =A0 =
=A0
=A0</font><font size=3D"1" face=3D"sans-serif">Bj=F8rn Mork <bjorn@mork =
.no></font>
<br><font size=3D"1" color=3D"#5f5f5f" face=3D"sans-serif">To: =A0 =A0 =A0
=A0</font><font size=3D"1" face=3D"sans-serif"><a href=3D"mailto:linux-thin=
kpad@linux-thinkpad.org" target=3D"_blank">linux-thinkpad@linux-thinkpad.or=
g</a></font>
<br><font size=3D"1" color=3D"#5f5f5f" face=3D"sans-serif">Date: =A0 =A0 =
=A0
=A0</font><font size=3D"1" face=3D"sans-serif">2013-04-28 12.32</font>
<br><font size=3D"1" color=3D"#5f5f5f" face=3D"sans-serif">Subject: =A0 =A0
=A0 =A0</font><font size=3D"1" face=3D"sans-serif">Re: [ltp] Re:
pwm controls in /sys</font>
<br><font size=3D"1" color=3D"#5f5f5f" face=3D"sans-serif">Sent by: =A0 =A0
=A0 =A0</font><font size=3D"1" face=3D"sans-serif"><a href=3D"mailto:linux-=
thinkpad-admin@linux-thinkpad.org" target=3D"_blank">linux-thinkpad-admin@l=
inux-thinkpad.org</a></font>
<br>
<hr noshade><div class=3D"HOEnZb"><div class=3D"h5">
<br>
<br>
<br><tt><font>Dave Cunningham <<a href=3D"mailto:sparkprime@gmail.com" t=
arget=3D"_blank">sparkprime@gmail.com</a>> writes:<br>
<br>
> Did some more experimentation -- this is how it seems to behave:<br>
><br>
> pwm1_enable =3D=3D 0<br>
> fan speed: 3800rpm<br>
><br>
> pwm1_enable =3D=3D 1<br>
> fan speed: 3100rpm to 0 depending on value in pwm (255 to 0)<br>
><br>
> pwm1_enable =3D=3D 2<br>
> fan speed varies automatically according to temperature, but is never
above<br>
> 3100<br>
<br>
This is consistent with the docs. =A0You can find an online version
here:<br>
</font></tt><a href=3D"https://www.kernel.org/doc/Documentation/hwmon/sysfs=
-interface" target=3D"_blank"><tt><font>https://www.kernel.org/doc/Document=
ation/hwmon/sysfs-interface</font></tt></a><tt><font><br>
<br>
<br>
Bj=F8rn<br>
-- <br>
The linux-thinkpad mailing list home page is at:<br>
</font></tt><a href=3D"http://mailman.linux-thinkpad.org/mailman/listinfo/l=
inux-thinkpad" target=3D"_blank"><tt><font>http://mailman.linux-thinkpad.or=
g/mailman/listinfo/linux-thinkpad</font></tt></a><tt><font><br>
<br>
</font></tt>
<br>
--=20
The linux-thinkpad mailing list home page is at:
<a href=3D"http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpa=
d" target=3D"_blank">http://mailman.linux-thinkpad.org/mailman/listinfo/lin=
ux-thinkpad</a>
</div></div></blockquote></div><br></div>
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