Yung Shen, could you please test http://cdimage.ubuntu.com/daily- live/current/ and advise to the results?
Also, please provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date ** Changed in: xorg (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1503168 Title: [Dell Inspiron 5551][8086:0f31] Unable to adjust brightness To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1503168/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs