[Bug 79985] New: xf86-video-intel-2.99.912 with dri3 enabled breaks gnome-shell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79985

          Priority: medium
            Bug ID: 79985
          Assignee: idr at freedesktop.org
           Summary: xf86-video-intel-2.99.912 with dri3 enabled breaks
                    gnome-shell
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jwrdegoede at fedoraproject.org
          Hardware: Other
            Status: NEW
           Version: 10.1
         Component: Drivers/DRI/i965
           Product: Mesa

Created attachment 100980
  --> https://bugs.freedesktop.org/attachment.cgi?id=100980&action=edit
Xorg.1.log

While preparing 1.15.99.903 server + 2.99.912 intel drv packages for Fedora 21,
I noticed that both gdm and gnome-shell (tested with startx) hang, they show
the initial background screen and then just sit there.

Building the server with --disable-dri3, or building the intel drv with a
hacked configure.ac to make it not build
with dri3 support fixes this.

I'm using mesa 10.2.1, which has been build with xgl-dri3 support, I've double
checked this. Chris Wilson thinks this is a mesa bug, hence this bug.

I'm attaching an Xorg.log from a run with xf86-video-intel build with
--debug=full. Note I switched away from the vt and killed Xorg (and thus the
hanging startx session) before saving the log, so that is part of the log too.

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