Just updated to Kernel 4.2.2, and the long-standing NVIDIA GPL-only issue is finally fixed.. From the changelog: commit 4f7760e963db10618dd3617bcf6254d896094e37 Author: Tim Gardner <tim.gardner@canonical.com> Date: Tue Aug 4 11:26:04 2015 -0600 workqueue: Make flush_workqueue() available again to non GPL modules And I can confirm that NVIDIA 355.11 compiles OK, without any patches.. The complete changelog is here: https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.2.2 … Continue reading →