Po-Hsu Lin, as per http://www.dell.com/support/home/us/en/04/product-support/product/latitude-3340-laptop/drivers an update to your computer's buggy and outdated BIOS is available (A05). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything? If it doesn't, could you please both specify what happened, and provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
Thank you for your understanding. ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1412329 Title: [Dell Latitude 3340] When closing the lid, the screen won't be off unless it's locked To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1412329/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs