After kernel upgrade to 4.4.0.58.45, the issue can not be reproduced. Thank you all.
** Tags added: verification-done-yakkety -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1433906 Title: Acer, Inc ID 5986:055a is useless after 14.04.2 installed. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1433906/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
