Matthew Garrett wrote:
On Sun, Jul 29, 2007 at 04:03:31PM +0200, Sune Mølgaard wrote:
The CPU of the machine is labeled as centrino compliant, but is in fact
a Celeron-M, and hence does not support _Enhanced_ Speedstep. However, I
clearly remember having frequency scaling working with Ubuntu kernel
2.6.15, but failing with Ubuntu 2.6.17 (possibly with some 2.6.18 code
backported).
It doesn't support Speedstep at all. You were probably using p4-clockmod
in the past, which is a mechanism for temperature control rather than
any sort of useful power saving.
Hi Matthew, and thanks for answering,
This might be as you describe, as I don't know which module was used
when it worked.
However, I got a warning dialogue window from the GNOME powernowd applet
about frequency scaling being unavailable upon the kernel upgrade, not
upon an upgrade of powernowd as one might suspect, if powernowd suddenly
seized to support p4-clockmod.
If I had bought the laptop today and encountered the problems, I would
probably reach the same conclusion as you, but IIRC powernowd doesn't
cooperate with p4-clockmod, and it was a kernel upgrade that made it
complain.
I stated earlier that I didn't recall if the BIOS or the kernel upgrade
came first, but digging into my memory of events, plus my normal way of
dealing with problems, I am now fairly sure that the kernel upgrade
borked frequency scaling (or clockmod, which I still find unlikely),
prompting the BIOS upgrade.
Best regards,
Sune Mølgaard
--
Men will wrangle for religion; write for it; fight for it; die for it;
anything but live for it.
- Charles Caleb Colton
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