Nathaniel: You need to boot to a kernel where your backlight doesn't work, i.e. no special kernel patches and no passing acpi_osi="!Windows 2012". Then try to adjust the backlight several times. After that run "dmesg > dmesg.txt" in a terminal and attach dmesg.txt.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1098216 Title: Regression in brightness control on Lenovo Thinkpad X230 and X1 Carbon To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1098216/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
