[Bug 94250] New: Intel driver crashes when undocking Lenovo T450s

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94250

            Bug ID: 94250
           Summary: Intel driver crashes when undocking Lenovo T450s
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: cs_gon at yahoo.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

I'm using Ubuntu 14.04 since installing the Wily HWE stack, the X-Server began
crashing when undocking the notebook (Lenovo T450s).

I tried a newer driver (GIT snapshot up to commit
e41040fb55e84fc72612ae503944a99814a5c9d3 , 15th Feb. 2016), but the X-Server
still crashes. The stacktrace looks a bit different when using the GIT version,
but still seems to be in the same area in the code (SNA page flips). The
stackstace for the GIT version is in stacktrace_nodebug.txt.

I have also compiled the driver with --enable-debug, then the X-Server exits
due to an assertion (as seen in Xorg.0.log.debug). I'm also attaching the
stacktrace for this case (stacktrace_debug.txt).

The kernel is the Ubuntu Wily kernel (4.2.0-27-generic).

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