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/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Tags added: kernel-da-key -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1246793 Title: Battery charging slows down laptop Status in “linux” package in Ubuntu: New Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1246793/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp