[Hardy] CPU freq scaling does not work anymore with the newest kernel

Have you recently suspended? Some people have seen the cpufreq stuff get a bit confused after resumes.
It's all working for me though:

-(cmsj@kodachi)-(~)- ls /sys/devices/system/cpu/cpu0/
cache cpufreq cpuidle crash_notes topology
-(cmsj@kodachi)-(~)- uname -a
Linux kodachi 2.6.24-12-generic #1 SMP Wed Mar 12 23:01:54 UTC 2008 i686 GNU/Linux
-(cmsj@kodachi)-(~)- grep model /proc/cpuinfo
model : 15
model name : Intel(R) Core(TM)2 Duo CPU L7100 @ 1.20GHz
model : 15
model name : Intel(R) Core(TM)2 Duo CPU L7100 @ 1.20GHz
-(cmsj@kodachi)-(~)-

yes I used suspend regularly.

However rebooting did not solve the problem.

Just rebooted with 2.6.24-8-generic and still have the same problem.

compaq:~# ls /sys/devices/system/cpu/cpu0/
cache cpuidle crash_notes topology

I don't get it..

Also all modules in [1] are loaded.

[1] /lib/modules/2.6.24-12-generic/kernel/drivers/cpufreq

modprobe -v speedstep-centrino
insmod /lib/modules/2.6.24-12-generic/kernel/arch/x86/kernel/cpu/cpufreq/speedstep-centrino.ko
FATAL: Error inserting speedstep_centrino (/lib/modules/2.6.24-12-generic/kernel/arch/x86/kernel/cpu/cpufreq/speedstep-centrino.ko): No such device

found this

Setting CPUFREQD_MODULE="acpi-cpufreq" in /etc/powersave/cpufreq fixed it. However I'm not sure why.

I also had to restart powersaved of course.

I also couldn't get it out of teh box working properly - Hardy Beta AMD64, newest updates - 2.6.25-5.26 kernel package.

It won't load acpi_cpufreq module at all - as in bug #201890 - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/201890

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage . I have classified this bug as a bug in linux the kernel for Hardy Heron.

is it fixed now? at least for me it works again, see the posts above

Not for me, on 2.6.24-16-generic I stil cannot load acpi_cpufreq.

Self-compiled vanilla kernel 2.6.24.4 + apparmor patches works as expected, so I suspect kernel compilation/packaging problem, as it seems stock kernel does not properly recognize my hardware (T5500 on i945GM chipset, worker perfectly in Gutsy).

CPU scaling works for me (amd64), but I seem to be only missing the /sys/**/cpufreq interface suddenly.
See bug 205087.
I tend to mark this one here as duplicate of 205087, but I'm not sure.

For some bizarre reason acpi-cpufreq loading fails in /etc/init.d/powernowd unless I add acpi-cpufreq to /etc/initramfs-tools/modules. When loading with VERBOSE=yes in /etc/default/rcS I can see that acpi-cpufreq reports "No device". :-/

I tried adding "echo -n 'Press Enter: ' && read line" in /etc/init.d/powernowd after modprobe, then I can switch to a second console, login, and "modprobe acpi-cpufreq" manually, which works without problems. I can't even begin to imagine why it works from console, but not from /etc/init.d/powernowd. :-/

For everyone having an issue with /sys/**/cpufreq missing, try adding acpi-cpufreq to /etc/initramfs-tools/modules.

Hello !

I had a similar problem : my CPU was about 100% working, impossible to surf on many sites with flash or java...

I read a message on a forum which explained a command I didn't know : "cpu-freq info".

The man who posted this message was blocked to 800MHz.

When I wrote that in a terminal, it asked me to install "cpufrequtils" and "libcpufreq0".

Once it been done, "cpu-freq info" worked.

I saw that I was not blocked and could run from 800MHz to 1,8GHz.

And I checked my CPU... it was about 45%, and I could go again on each website with firefox !

So I read the "cpu-freq info" message and saw the difference with that man. As driver, I have "powernow-k8" and not "acpi-cpufreq".

I don't know if it's this "installation" which solved my problem, but I wanted to post that in order (maybe) to help you.

If you need that I post some data, just ask.

Hope a french (that I'm) could help you !

The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test:

1) If you are comfortable installing packages on your own, the linux-image-2.6.27-* package is currently available for you to install and test.

--or--

2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD.

Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback.

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!