[Bug 98213] New: REGRESSION: GPU hangs when enable_fbc=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98213

            Bug ID: 98213
           Summary: REGRESSION: GPU hangs when enable_fbc=1
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: gwhite at kupulau.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 127238
  --> https://bugs.freedesktop.org/attachment.cgi?id=127238&action=edit
dmesg

This is on Skylake/4.9pre-rc1.

Enabling fbc (enable_fbc=1) on skylake causes near-constant GPU hangs/resets. 
This is new since 4.8 final.  Booting with enable_fbc=0 or enable_fbc=-1 works.

I understand this is probably unsupported, but thought it might be useful to
point this out.

dmesg and cpuinfo attached.  This was right after boot with graphical login
started.  The hangs continue with the same signature after my desktop
environment starts.

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