[Bug 95467] New: i815: GPU hangs in v4.6 on CHT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95467

            Bug ID: 95467
           Summary: i815: GPU hangs in v4.6 on CHT
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pierre-louis.bossart at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123857
  --> https://bugs.freedesktop.org/attachment.cgi?id=123857&action=edit
dmesg log for first test

V4.5 works fine on CHT (Tronsmart Ara X5 Plus)
V4.6 is broken, UI is frozen in less than 20 seconds when moving windows
around.

the drm-intel-nightly works fine, apparently due to this commit:

commit a5e485a95c9c4cdd93b4c6dc53eee3bd1e50de11
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Wed Apr 13 21:19:51 2016 +0300

    drm/i915: Clear VLV_IER around irq processing


Attached results of 2 tests which show similar behavior.

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