[Bug 96899] gen7 regression [bisected]: GPU hangs when attempting to bring up gdm login screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96899

            Bug ID: 96899
           Summary: gen7 regression [bisected]: GPU hangs when attempting
                    to bring up gdm login screen
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: awatry at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 125028
  --> https://bugs.freedesktop.org/attachment.cgi?id=125028&action=edit
dmesg output with hangs

A week or so ago I had to reboot my laptop at work, and when it came back up,
all I saw was a cursor on a black screen, instead of my login prompt.

Hardware: Haswell i7 mobile (Core i7-4810MQ), 16GB RAM
OS: Ubuntu 16.04, x86-64, mesa/libdrm from git, kernel 4.6.3 from mainline
kernel ppa

I knew that this had been working as of my last reboot, and also with 11.2
installed, so I spent a bit of time last night bisecting down to:

39fdee6b2df3cb297c0d2aba285f6991824867b9 is the first bad commit
commit 39fdee6b2df3cb297c0d2aba285f6991824867b9
Author: Topi Pohjolainen <topi.pohjolainen at intel.com>
Date:   Wed May 18 22:07:05 2016 +0300

    i965/blorp/gen7+: Do not trigger push constant space reconfig

    Signed-off-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>


During bisecting steps, I did a full power-cycle and cold boot, as warm reboots
did NOT necessarily reproduce the issue reliably. This is still an issue in
mesa git as of July 11.

dmesg is attached

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