[Bug 78293] New: In a tri-head configuration on a laptop, one of the external screens is not repainted

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78293

          Priority: medium
            Bug ID: 78293
          Assignee: chris at chris-wilson.co.uk
           Summary: In a tri-head configuration on a laptop, one of the
                    external screens is not repainted
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mail at kirill-mueller.de
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

This is a relaunch of https://bugs.freedesktop.org/show_bug.cgi?id=76271 .

Ubuntu 13.10, Intel video driver and i-v-o from Git (ef178f7). One of my two
external screens is not repainted and does not even show the cursor. In "perf
top", heavy usage is shown for nvidia_drv.so and [drm] when running glxgears:

 35.94%  [drm]                               [k] drm_clflush_page
  9.90%  nvidia_drv.so                       [.] 0x000000000007f0a4
  8.88%  [kernel]                            [k] mutex_spin_on_owner
  4.39%  [kernel]                            [k] __sg_page_iter_next.part.9
  3.00%  i965_dri.so                         [.] 0x0000000000032a36
  2.40%  [kernel]                            [k] __sg_page_iter_next
  2.14%  [kernel]                            [k] mspin_lock
  2.04%  intel_drv.so                        [.]
memcpy_from_tiled_x__swizzle_9_
  0.87%  [kernel]                            [k] __ticket_spin_lock
  0.87%  perf                                [.] 0x000000000004bb42
  0.81%  libxul.so                           [.] 0x00000000018f56ee
  0.62%  Xorg                                [.] 0x000000000013d3b8
  0.59%  libdrm_intel.so.1.0.0               [.] 0x00000000000066a2
  0.58%  libdricore9.2.1.so.1.0.0            [.] 0x0000000000149852
  0.52%  [i915]                              [k] ivybridge_irq_handler
  0.50%  [drm]                               [k] drm_clflush_sg

No heavy lag anymore.

Things to check:

- Stock video driver (I think this works, but will re-check)
- Setting Option "AllowSHMPixmaps" "true" in /etc/bumblebee/xorg.conf.nvidia
(will check)
- Attach debug output from i-v-o
- ?

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