I also have an E5420 and I have the exact same issue. It is really annoying. There used to be a work around
echo N> /sys/module/drm_kms_helper/parameters/poll This would fix the slow downs but had other side effects like not detecting displays automatically etc. This should not be a "Certified for Ubuntu" Laptop it quite obviously has not been tested! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/998204 Title: Intel chipset driver bug on Ubuntu certified Dell Latitude E5420: connecting power cord makes kworker run amok To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/998204/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
