The bug was fixed until the last update of the kernel on Ubuntu 14.10. Somehow the latest kernel update created a regression which reopened the issue!
** Changed in: xorg (Ubuntu) Status: Invalid => Opinion -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1286842 Title: 8086:0166 [Lenovo ThinkPad X1 Carbon] Ubuntu HD 4000 drivers occasional flickering To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1286842/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp