I've filed https://bugs.freedesktop.org/show_bug.cgi?id=94593 . After bisecting the intel-drm-next branch I believe 921ec285a6589cf3beb7f56a70744f75b09349f8 to be the culprit.
** Bug watch added: freedesktop.org Bugzilla #94593 https://bugs.freedesktop.org/show_bug.cgi?id=94593 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1540390 Title: Backport more recent driver for SKL, KBL and BXT graphics Status in linux package in Ubuntu: Fix Released Bug description: We need to support Skylake (SKL), Kabylake (KBL) and Broxton (BXT) graphics in xenial, but the kernel driver is not fresh enough for proper support. For the kernel the plan is to provide a separate driver module (i915_bpo) like for Skylake/Broadwell/Braswell in vivid. The drm/i915 driver in 4.4 is not recent enough for SKL/KBL/BXT, so pulling the driver from current drm-intel-next branch would provide what'll end up in 4.6. The i915 drivers will be modified so that only i915_bpo loads on SKL/KBL/BXT machines, and only there. The driver will get further updates along the way, and possibly also rebased to a later kernel release. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1540390/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
