Sorry, I have found the problem. Thunderbird was not idle, it was downloading a large imap account since 15 days :) I close this bug.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1804501 Title: Thunderbird permanetly consume between 50% and 100% of one proc when idle Status in thunderbird package in Ubuntu: Invalid Bug description: The problem occurs under an up-to-date ubuntu 18.10. On this system, thunderbird use more 50% of one core permanently. I have deactivated all supplementary modules and get the same results. package version : 1:60.2.1+build1-0ubuntu1 My expectation is to have an idle thunderbird consuming less than 5% of a core, as it used to, and so save my battery life. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1804501/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp