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Re: CPU frequency-changing comes and goes
On Mon, 21 Apr 2008 17:12:13 -0400
"Jared D. McNeill" <jmcneill%invisible.ca@localhost> wrote:
> Steven M. Bellovin wrote:
> > Sometimes, when I reboot my laptop (Thinkpad T61 running
> > amd64-4.99.54 at the moment), the kernel doesn't detect speedstep.
> > If I try to run estd, I get
> > estd: Cannot guess CPU-scaling technology. (maybe you are
> > missing some kernel-option?)
> > Similarly,
> > $ sysctl -a|grep freq
> > gives no output.
> > It isn't a kernel build option; a reboot will usually bring it back.
> > I've attached /var/run/dmesg from the last boot.
> When it fails are you booting with the AC adapter unplugged? If so:
That could very well be it; I haven't isolated the conditions that
cause it. I'll watch; thanks.
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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