Your message dated Tue, 30 Dec 2014 11:43:24 +0100
with message-id <[email protected]>
and subject line Re: Bug#774199: linux-image-3.16.0-0.bpo.4-amd64: most cpufreq
governors newly unavailable
has caused the Debian Bug report #774199,
regarding linux-image-3.16.0-0.bpo.4-amd64: most cpufreq governors newly
unavailable
to be marked as done.
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774199: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774199
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--- Begin Message ---
Package: src:linux
Version: 3.16.0-0.bpo.4
On my other system, which is a laptop, with linux-image-3.2.0-4-amd64
cpufrequtils starts correctly out of the box, and the contents of
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors is:
powersave userspace conservative ondemand performance
But with linux-image-3.16.0-0.bpo.4 booted on the same machine,
I get the dreaded message
"Setting ondemand CPUFreq governor...disabled, governor not available"
and indeed, scaling_available_governors contains just
powersave performance
So this looks on the face as a kernel regression, although many other
suspects come to mind as well.
The machine is a Dell XPS with a 4-way Intel Core i7-3571U. Let me know
if I can provide any more useful information.
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--- Begin Message ---
On Mon, 2014-12-29 at 21:59 -0800, Ian Zimmerman wrote:
> Package: src:linux
> Version: 3.16.0-0.bpo.4
>
> On my other system, which is a laptop, with linux-image-3.2.0-4-amd64
> cpufrequtils starts correctly out of the box, and the contents of
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors is:
>
> powersave userspace conservative ondemand performance
>
> But with linux-image-3.16.0-0.bpo.4 booted on the same machine,
> I get the dreaded message
> "Setting ondemand CPUFreq governor...disabled, governor not available"
> and indeed, scaling_available_governors contains just
>
> powersave performance
>
> So this looks on the face as a kernel regression, although many other
> suspects come to mind as well.
>
> The machine is a Dell XPS with a 4-way Intel Core i7-3571U. Let me know
> if I can provide any more useful information.
This is expected behaviour on systems where the intel_pstate driver is
used.
Some background:
http://www.phoronix.com/scan.php?page=news_item&px=MTM3NDQ
Ben.
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Ben Hutchings
It is easier to write an incorrect program than to understand a correct one.
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