This issue can be reproduced on another E6430 here, with the same A18 BIOS / 4.10.0-19 kernel. (But the interesting thing is that it cannot be reproduced with its variant, E6430ATG, even if they're all I+N config, and using the same BIOS)
Some debug info with the 4.11rc7 mainline kernel kernel@kernel-Latitude-E6430:~$ ls /sys/class/backlight/ intel_backlight nv_backlight kernel@kernel-Latitude-E6430:~$ uname -a Linux kernel-Latitude-E6430 4.11.0-041100rc7-generic #201704161731 SMP Sun Apr 16 21:32:58 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux ** Tags added: 201201-10372 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1683445 Title: E6430 brightness control not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1683445/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
