Marking as Invalid (ideally would be Won't fix) (was New) because
previous comments suggest that Intel recommend not activating CPU
scaling under 2GHz.
** Changed in: acpi (Ubuntu)
Status: New = Invalid
** Changed in: linux-source-2.6.17 (Ubuntu)
Status: New = Invalid
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Edgy
We don't support the use of p4-clockmod - on average, it will
save less power than the centrino driver even if it provides
lower frequencies.
That may be true, but the centrino driver does not work on my box -- it
is not centrino, just and old celeron.
None of the speedstep modules could be
Celerons don't support voltage scaling. p4-clockmod throttles the CPU
rather than scaling the frequency, and has sufficient latency that
enabling it by default causes serious problems. I'm afraid I'm going to
have to reject this.
The reason for disabling frequencies below 2GHz is that under
I cannot say that I understand fully. I would be grateful for a
reference to the official (Intel) recommendation.
Also please note that when the system is running on batteries, the BIOS
scales the processor down to 1.2 GHz automatically. Is this unsafe as
well? I have used this machine under
** Attachment added: Output of cat /proc/cpuinfo
http://librarian.launchpad.net/4618188/cpuinfo
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Edgy beta 1: scaling_available_frequencies list incomplete
https://launchpad.net/bugs/63639
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** Attachment added: dmesg
http://librarian.launchpad.net/4618189/dmesg
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One more thing. When setting up scaling, I followed this tutorial:
http://www.freewebs.com/duckzland/t240.html#CPU
This is for Fedora, but it worked (with the necessary, but obvious
changes).
Also, throttling is not supported:
cat /proc/acpi/processor/CPU0/throttling
not supported
--
Edgy
** Attachment added: lsmod
http://librarian.launchpad.net/4618190/lsmod
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** Changed in: acpi (Ubuntu)
Sourcepackagename: acpi = linux-source-2.6.17
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We don't support the use of p4-clockmod - on average, it will save less
power than the centrino driver even if it provides lower frequencies.
However, the problem appears to be that in edgy we're disabling
frequencies below 2GHz because of a processor errata. I'll check whether
this is actually
Oh, hmm. Ben:
[17179610.06] acpi_cpufreq: Unknown symbol cpu_online_map
?
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