And can you ensure 4.4 final is bad? It is available from: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily/
If 4.4 final is bad, I can reverse bisect between 4.4 and 4.5-rc1. However, if 4.4 final is good(Which it probably will be), we will have to go back to performing a standard bisect between upstream 4.4.40 and 4.4.41. The regression came via a 4.4.41 stable update from mainline. However, the bug is not happening in any of the other 4.5-rc1 or greater kernels that you tested. It might take a lot of testing from the results posted in comment #31 to find the commit that fixes the bug. It might be the regression was introduced in one of the 4.5, 4.7 or 4.9 release candidates and fixed right away. Although it should have came down in newer 4.4 stable updates but 4.4.55 still has the bug also per comment #31. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1667323 Title: Backlight control does not work and there are no entries in /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
