[Bug 97817] New: [BAT] [HSW] gem_exec_suspend at basic-s3 hang occasionally

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97817

            Bug ID: 97817
           Summary: [BAT] [HSW] gem_exec_suspend at basic-s3 hang
                    occasionally
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jari.tahvanainen at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On fi-hsw-4770k gem_exec_suspend at basic-s3 does not complete.

E.g. for the last incomplete run CI_DRM_1635 (14-Sep-2016) dmesg tail has
...
[  355.860011] gem_exec_suspend: executing
[  355.860109] [drm:i915_gem_open] 
[  355.861772] [drm:i915_gem_open] 
[  355.862351] gem_exec_suspend: starting subtest basic
[  355.958711] gem_exec_suspend: exiting, ret=0
[  356.096236] gem_exec_suspend: executing
[  356.096337] [drm:i915_gem_open] 
[  356.097855] [drm:i915_gem_open] 
[  356.098518] gem_exec_suspend: starting subtest basic-S3
while on the execution CI_DRM_1637 having Success the dmesg looks like
...
[  332.936844] gem_exec_suspend: executing
[  332.936940] [drm:i915_gem_open] 
[  332.938575] [drm:i915_gem_open] 
[  332.939160] gem_exec_suspend: starting subtest basic
[  333.035632] gem_exec_suspend: exiting, ret=0
[  333.170070] gem_exec_suspend: executing
[  333.170166] [drm:i915_gem_open] 
[  333.171718] [drm:i915_gem_open] 
[  333.172307] gem_exec_suspend: starting subtest basic-S3
[  333.686847] PM: Syncing filesystems ... done.
[  333.687901] Freezing user space processes ... (elapsed 0.001 seconds) done.
[  333.689489] Double checking all user space processes after OOM killer
disable... (elapsed 0.000 seconds) 
[  333.689547] Freezing remaining freezable tasks ... (elapsed 0.001 seconds)
done.
[  333.690692] Suspending console(s) (use no_console_suspend to debug)
[  333.692391] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[  333.692985] sd 0:0:0:0: [sda] Stopping disk
[  333.697233] serial 00:05: disabled
[  333.699109] [drm:connected_sink_compute_bpp] [CONNECTOR:44:HDMI-A-2]
checking for sink bpp constrains
...

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