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Bug#774199: marked as done (linux-image-3.16.0-0.bpo.4-amd64: most cpufreq governors newly unavailable)

Your message dated Tue, 30 Dec 2014 11:43:24 +0100
with message-id <1419936204.5686.37.camel@decadent.org.uk>
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.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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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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--- End Message ---
--- 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.

-- 
Ben Hutchings
It is easier to write an incorrect program than to understand a correct one.

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