My workaround is to install linux-4.4.8-willy. It works to me. URL is http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.8-wily/ and refer below url to install.
http://linuxdaddy.com/blog/install-kernel-4-4-on-ubuntu/ -- 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/1559308 Title: Plugging HDMI screen in causes system hang To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1559308/+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
