Battery charging slows down laptop

[Dac Chartrand]

Following up on Bug #962712 which was marked as invalid, instead of fixed (gee, thanks...) I'm using Ubuntu 13.10 and this still happening pretty badly.

Steps to reproduce:

1) Unplug laptop, plug-in second monitor, drain battery until OS warns user and asks her to plugin laptop
2) Plugin laptop

Expected: Laptop works normally
Actual: Laptop slows down severely.

-=-=-

Drilling down, run `cpufreq-info`

Expected:
driver: acpi-cpufreq [...]
current policy: frequency should be within 800 MHz and 2.80 GHz.

Actual:
driver: acpi-cpufreq [...]
current policy: frequency should be within 800 MHz and 800 MHz

-=-=-

Drilling down, this is known, lingering problem, and is not "invalid", please triage instead of sweeping under the rug

 * http://ubuntuforums.org/showthread.php?t=1921292
 * http://askubuntu.com/questions/186387/laptop-slows-down-while-charging-battery
 * http://bit.ly/17vgUO0
 * ...

-=-=-

Thank you for your consideration.
---
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: dac514 2414 F.... pulseaudio
DistroRelease: Ubuntu 13.10
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=b95f5ff9-5665-42f8-8b10-f2ae3ca2411f
InstallationDate: Installed on 2012-06-12 (505 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: LENOVO 4286CTO
MarkForUpload: True
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=59641606-e542-4c74-8a31-08c66bfae100 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-12-generic N/A
 linux-backports-modules-3.11.0-12-generic N/A
 linux-firmware 1.116
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
Tags: saucy
Uname: Linux 3.11.0-12-generic x86_64
UpgradeStatus: Upgraded to saucy on 2013-10-08 (23 days ago)
UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo
WifiSyslog:

dmi.bios.date: 07/18/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET69WW (1.39 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4286CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4286CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO

[Joseph Salisbury (jsalisbury)]

Did this issue occur in a previous version of Ubuntu, or is this a new issue?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.12 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc7-saucy/

[Dac Chartrand (conner-bw)]

Thanks for the reply.

I am unable to test kernel-unable-to-test-upstream due to incompetence. Sorry.

Yes, the bug has been around for a while, it also affects other distros, ie. some comments in Bug #887793 (Comments 80, 81, ...) are related to this problem.

Regards,

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1246793

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

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[Dac Chartrand (conner-bw)]

Yes, this issue has occurred for me since Ubuntu 12.10

The workaround is to unplug, and then quickly replug, my laptop. (Or reboot)

[penalvch (penalvch)]

Dac Chartrand, did this issue not occur in a release prior to Quantal?

[Dac Chartrand (conner-bw)]

I didn't this laptop before Quantal, I ran a desktop tower before, so I cannot confirm.

[Dac Chartrand (conner-bw)]

Sorry, to be more "Precise" :) I did in fact install Precise on this laptop. (2012-06-12) but I don't remember having this problem.

I had both a desktop and a laptop at that time, and I was using the desktop tower more often than the laptop. I upgraded to Quantal and began using the laptop more often when 12.10 was released. I first notice the problem on 2012-11-23.

Executive summary: Cannot confirm.

[penalvch (penalvch)]

Dac Chartrand, for regression testing purposes, could you please test Lucid via http://old-releases.ubuntu.com/releases/lucid/ and advise to the results?

[Dac Chartrand (conner-bw)]

No, I will not test Lucid. Sorry.

Best regards,

[Alan Pater (alan-pater)]

Looks like you have run into the infamous CPU frequency issue.

http://www.thinkwiki.org/wiki/Problem_with_CPU_frequency_scaling

Solution is to make sure you are running with high quality AC power.

Workaround is to edit /etc/default/grub

Find the following line and add processor.ignore_ppc=1
so it looks like this:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash processor.ignore_ppc=1"

then
  sudo update-grub && sudo reboot.

Have a nice day.

[Dac Chartrand (conner-bw)]

Thanks Alan Pater.

Please mark this bug as "Won't Fix." Alan's explanation is sufficient to me (the original reporter.)

Cheers.

[penalvch (penalvch)]

Dac Chartrand, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1246793/comments/26. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.