[ltp] HPET timer on thinkpads?

[Matthias Runge]

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2007/10/22, Igor V. Rafienko <igorr@ifi.uio.no>:
>
> on Oct 22, 2007, 14:11, Henrique de Moraes Holschuh wrote:
>
> [ ... ]
>
> > The T43 does have an HPET, but you need patches in the -rt (real-time)
> > kernel to force-enable it.  And I am not sure it actually saves any
> > power in the specific case of the T43.
>
>
> Incidentally, it seems that 2.6.23 with hpet, no-ticks, cpuidle and all
> that draws about 1.3W *more*  than 2.6.22 without the hpet-patches. Does
> anyone else experience that?


Yes, I can confirm that. For me, this issue was solved by  unloading the
usb_uhci module.
The Processor stays in c2 state, while usb_uhci is loaded, unloading uhci
enables c4 power saving.

Matthias

ivr
> --
> Women wearing Wonder bras and low-cut blouses lose their right to
> complain about having their boobs stared at.
>                                 "Things men wish women knew"
> --
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>

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<br><br><div><span class="gmail_quote">2007/10/22, Igor V. Rafienko &lt;<a href="mailto:igorr@ifi.uio.no">igorr@ifi.uio.no</a>&gt;:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
on Oct 22, 2007, 14:11, Henrique de Moraes Holschuh wrote:<br><br>[ ... ]<br><br>&gt; The T43 does have an HPET, but you need patches in the -rt (real-time)<br>&gt; kernel to force-enable it.&nbsp;&nbsp;And I am not sure it actually saves any
<br>&gt; power in the specific case of the T43.<br><br><br>Incidentally, it seems that 2.6.23 with hpet, no-ticks, cpuidle and all<br>that draws about 1.3W *more*&nbsp;&nbsp;than 2.6.22 without the hpet-patches. Does<br>anyone else experience that?
</blockquote><div><br>Yes, I can confirm that. For me, this issue was solved by&nbsp; unloading the usb_uhci module. <br>The Processor stays in c2 state, while usb_uhci is loaded, unloading uhci enables c4 power saving.<br><br>
Matthias<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">ivr<br>--<br>Women wearing Wonder bras and low-cut blouses lose their right to
<br>complain about having their boobs stared at.<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;Things men wish women knew&quot;<br>--<br>The linux-thinkpad mailing list home page is at:<br><a href="http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad">
http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad</a><br></blockquote></div><br>

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