[Bug 93608] New: bisected: i915 SNB modeset crash in ac9b8236551d1177fd07b56aef9b565d1864420d

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93608

            Bug ID: 93608
           Summary: bisected: i915 SNB modeset crash in
                    ac9b8236551d1177fd07b56aef9b565d1864420d
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mroos at linux.ee
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 120833
  --> https://bugs.freedesktop.org/attachment.cgi?id=120833&action=edit
good dmesg with debug

This is a followon to meiling list bug report with subject
bisected: i915 modeset broken in ac9b8236551d1177fd07b56aef9b565d1864420d

Between 4.4-rc3 and 4.4-rc4, i915 modesetting broke on my i5-2400 PC. 
Instead of seeing the new dense graphics mode, I see the last VGA text 
lines and no X appears either.

I saw something similar on I865G but have not had time to check if it is 
the same issue.

ac9b8236551d1177fd07b56aef9b565d1864420d is the first bad commit
commit ac9b8236551d1177fd07b56aef9b565d1864420d
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Fri Nov 27 18:55:26 2015 +0200

    drm/i915: Introduce a gmbus power domain

    Currently the gmbus code uses intel_aux_display_runtime_get/put in an
    effort to make sure the hardware is powered up sufficiently for gmbus.
    That function only takes the runtime PM reference which on VLV/CHV/BXT
    is not enough. We need the disp2d/pipe-a well on VLV/CHV and power well
    2 on BXT. So add a new power domnain for gmbus and kill off the now
    unused intel_aux_display_runtime_get/put. And change
    intel_hdmi_set_edid() to use the gmbus power domain too since that's all
    we need there.

    Also toss in a BUILD_BUG_ON() to catch problems if we run out of
    bits for power domains. We're already really close to the limit...

    [Patrik: Add gmbus string to debugfs output]

    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Reviewed-by: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
    [Cherry-picked from drm-intel-next-queued f0ab43e6 (Imre)]
    Signed-off-by: Imre Deak <imre.deak at intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/1448643329-18675-3-git-send-email-imre.deak@intel.com
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

:040000 040000 39379146d7e6dda8a4d5f8781ee3d307cce8c47e
f4f09fae0485ad6263d31d425296fa9cd7de343b M     drivers

As per Ville Syrjäläs suggestion, attached are boot logs with drm.debug=0xe.

Monitor is connected via DVI.

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