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shadeless

Member

Registered: 2013-05-26

Posts: 83

Laptop Mode Tools causes frequency scaling governor error on shut down

Hi guys,
When I have the laptop mode tools service enabled, I get some errors whenever I shut down my computer. I can't catch the errors because they move by pretty quickly, and I can't find the error anywhere in /var/log directory. But I think it says something along the lines of KERNEL ERROR blah/freq_scaling_governor.

The error does not occur when I disable laptop mode tools. I have also tried uninstalling and reinstalling laptop-mode-tools and acpid, but that didn't change the error.

How can I log the errors that occur on shutdown so that I can have the exact error?

What can I do to remove this error?

Thank you for any help you may give me

cfr

Member

From: Cymru

Registered: 2011-11-27

Posts: 7,178

Re: Laptop Mode Tools causes frequency scaling governor error on shut down

Do you by any chance use intel graphics?

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shadeless

Member

Registered: 2013-05-26

Posts: 83

Re: Laptop Mode Tools causes frequency scaling governor error on shut down

Yes, I'm using the Intel HD 4000.

cfr

Member

From: Cymru

Registered: 2011-11-27

Posts: 7,178

Re: Laptop Mode Tools causes frequency scaling governor error on shut down

So probably you are not using the cpufreq module any more. What does cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver give? If it says intel_pstate then you could eliminate the errors by disabling laptop-mode-tools attempts to control cpu frequency governors (/etc/laptop-mode/conf.d/cpufreq.conf) although the errors are harmless as far as I know.

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CLI Paste | How To Ask Questions

Arch Linux | x86_64 | GPT | EFI boot | refind | stub loader | systemd | LVM2 on LUKS
Lenovo x270 | Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz | Intel Wireless 8265/8275 | US keyboard w/ Euro | 512G NVMe INTEL SSDPEKKF512G7L

shadeless

Member

Registered: 2013-05-26

Posts: 83

Re: Laptop Mode Tools causes frequency scaling governor error on shut down

Running cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver did give me intel_pstate.

Disabling laptop-mode-tools cpu frequency governors seems to have gotten rid of the error messages.

For future reference, where can I find all my error logs and a log of messages that occur when I log out? I still seem to get some errors, but I can never read what they are.

cfr

Member

From: Cymru

Registered: 2011-11-27

Posts: 7,178

Re: Laptop Mode Tools causes frequency scaling governor error on shut down

journalctl will give you a lot. For example, I can see the acpi_cpufreq error there on my system. (I have not eliminated it in case I boot the LTS kernel which needs it.) The very last messages cannot be logged, of course, because the log files are not available once the file system has been unmounted.

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CLI Paste | How To Ask Questions

Arch Linux | x86_64 | GPT | EFI boot | refind | stub loader | systemd | LVM2 on LUKS
Lenovo x270 | Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz | Intel Wireless 8265/8275 | US keyboard w/ Euro | 512G NVMe INTEL SSDPEKKF512G7L

WonderWoofy

Member

From: Los Gatos, CA

Registered: 2012-05-19

Posts: 8,414

Re: Laptop Mode Tools causes frequency scaling governor error on shut down

Use the journal, which is controlled by journalctl.  They live in /var/log/journal, but they are binary so they must be read with the journalctl tool.

Edit: Damit it!  12s too slow!

Last edited by WonderWoofy (2013-08-25 01:52:25)