Public bug reported: Switching between extended/mirror modes when a HDMI monitor is plugged in causes a system hang on at least some machines, like my SKL-Y ultramobile test system. It needs a backport of an upstream commit from 4.3, modified to work on 4.2-based i915_bpo:
commit f015c5518879fb3e578caaa63806617468a24045 Author: Ville Syrjälä <ville.syrj...@linux.intel.com> Date: Wed Jun 24 22:00:02 2015 +0300 drm/i915: Split atomic wm update to pre and post variants -- the watermark stuff is Skylake-specific, so can't regress BSW/BDW. This has been tested on a number of SKL machines now, fixing the bug. ** Affects: linux (Ubuntu) Importance: High Status: In Progress ** Affects: linux (Ubuntu Vivid) Importance: Critical Assignee: Timo Aaltonen (tjaalton) Status: In Progress ** Also affects: linux (Ubuntu Vivid) Importance: Undecided Status: New ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: New => In Progress ** Changed in: linux (Ubuntu Vivid) Importance: Undecided => Critical ** Changed in: linux (Ubuntu Vivid) Status: New => In Progress ** Changed in: linux (Ubuntu Vivid) Assignee: (unassigned) => Timo Aaltonen (tjaalton) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1493746 Title: [SKL, i915_bpo] System hang when switching between extended/mirror modes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1493746/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs