[Bug 95007] New: [HSW Regression] System freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95007

            Bug ID: 95007
           Summary: [HSW Regression] System freeze
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: andreas.reis at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123037
  --> https://bugs.freedesktop.org/attachment.cgi?id=123037&action=edit
drm.debug=0xff on 4770

drm-intel-nightly: 2016y-04m-18d-17h-17m-00s

The freeze is instantaneous / complete, no trace or otherwise makes it to disk
or just netconsole (hence the helpful title). Attached are the last 3000 or so
lines from netconsole with drm.debug=0xff.

Been seeing these when trying drm-intel-nightly on my 4770 (1440p+1080p HDMI)
and 4200U (1080p eDP) since about one or two weeks ago.

I have (obviously) no idea what is causing it, seems it even appears during
idling, however running a bunch of glxgears and then starting mpv with a h.264
(8-bit, 1080p, via vaapi&opengl) seems to instantly evoke it more often than
not (with compton as compositor, which uses opengl-swc for vsync).

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