[Bug 87481] New: [BYT]igt/pm_rpm/i2c sporadically fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87481

            Bug ID: 87481
           Summary: [BYT]igt/pm_rpm/i2c sporadically fails
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 111031
  --> https://bugs.freedesktop.org/attachment.cgi?id=111031&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure

Non-working platforms: BYT

==kernel==
--------------------------
drm-intel-nightly/1eaf0ed4ec4f11915ff6a85abd910d753d28f5f4
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Dec 18 23:01:25 2014 +0100

    drm-intel-nightly: 2014y-12m-18d-22h-00m-57s UTC integration manifest

==Bug detailed description==
-----------------------------
Run 3 times, it fails one in 3 runs.
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./pm_rpm
--run-su                                                                       
                         btest i2c
IGT-Version: 1.9-g6999b70 (x86_64) (Linux:
3.18.0_drm-intel-nightly_1eaf0e_20141                                          
                                                      219+ x86_64)
Runtime PM support: 1
PC8 residency support: 0
Test assertion failure function test_i2c, file pm_rpm.c:644:
Failed assertion: i2c_edids == drm_edids
Last errno: 6, No such device or address
error: 1 != 2
Subtest i2c: FAIL (1.605s)
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./pm_rpm
--run-subtest i2c
IGT-Version: 1.9-g6999b70 (x86_64) (Linux:
3.18.0_drm-intel-nightly_1eaf0e_20141219+ x86_64)
Runtime PM support: 1
PC8 residency support: 0
Subtest i2c: SUCCESS (4.903s)
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./pm_rpm
--run-subtest i2c
IGT-Version: 1.9-g6999b70 (x86_64) (Linux:
3.18.0_drm-intel-nightly_1eaf0e_20141219+ x86_64)
Runtime PM support: 1
PC8 residency support: 0
Subtest i2c: SUCCESS (4.899s)


==Reproduce steps==
---------------------------- 
1. ./pm_rpm --run-subtest i2c

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