← Back to team overview

kernel-packages team mailing list archive

[Bug 1493746] Re: [SKL, i915_bpo] System hang when switching between extended/mirror modes


Verified the kernel build with the said patch on multiple failed Intel
SKL systems and it made display mode switching work reliably.

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  [SKL, i915_bpo] System hang when switching between extended/mirror

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Vivid:
  In Progress

Bug description:
  Switching between extended/mirror modes when an external 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.syrjala@xxxxxxxxxxxxxxx>
  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.

To manage notifications about this bug go to: