I'd like to perform a bisect to figure out what commit caused this regression. We need to identify the earliest kernel where the issue started happening as well as the latest kernel that did not have this issue.
Can you test the following kernels and report back? We are looking for the first kernel version that exhibits this bug: v3.12 final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-trusty/ If v3.12 final does not exhibit the bug, we should move on to testing some of the v3.13 release candidates. v3.13-rc3: http://kernel.ubuntu.com/~kernel- ppa/mainline/v3.13-rc3-trusty/ If v3.13-rc3 does not exhibit the bug then test v3.13-rc6: v3.13-rc6: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc6-trusty/ If v3.13-rc3 does exhibit the bug then test v3.13-rc2: v3.13-rc2: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc2-trusty You don't have to test every kernel, just up until the kernel that first has this bug. Thanks in advance! ** Changed in: linux (Ubuntu) Status: Incomplete => Triaged ** Tags added: performing-bisect -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1309584 Title: [HP EliteBook Folio 9470m Notebook PC] Backlight does not work on intel driver after upgrade from 13.10 -> 14.04, acpi_backlight=vendor solves To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1309584/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
