There are over 400 changes to i915 between Ubuntu-4.3.0-7.18 and Ubuntu-4.4.0-2.16. We should probably narrow down the exact kernel version that introduced this first. At the same time, we can see if this is Ubuntu specific, so testing the upstream kernels is best.
We need to identify the earliest kernel that did not exhibit the bug and the first kernel that did exhibit the bug. Can you test the following kernels and post back? v4.4 final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily/ If v4.4 final exhibits the bug, we should move on to testing some of the v4.4 release candidates. v4.4-rc4: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc4-wily/ If v4.4-rc4 does not exhibit the bug then test v4.4-rc6: v4.4-rc6: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc6-wily/ If v4.4-rc4 does exhibit the bug then test v4.4-rc2: v4.4-rc2: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc2-wily/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1543683 Title: Fails to detect (second) display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1543683/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
