[Bug 66533] New: [Bisected]igt/debugfs_reader i915 sysfs path not found

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66533

          Priority: high
            Bug ID: 66533
                CC: xunx.fang at intel.com, yangweix.shui at intel.com
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Bisected]igt/debugfs_reader i915 sysfs path not found
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:
--------------------------
Arch:           x86_64
Platform:       ILK/SNB/IVB/HSW
Kernel:         drm-intel-next-queued ef86ddced720fddc3835558447a7f594d3609c73

Bug detailed description:
-----------------------------
It  happens on ironlake sandybridge ivybridge and haswell with
drm-intel-next-queued and drm-intel-fixes kernel.
Following cases also have this issue:
igt/debugfs_emon_crash
igt/test_rte_check
igt/ZZ_hangman

Bisect shows:6fd652ac1db1b572af6cc4a040ca357707503f5b is the first bad commit.
commit 6fd652ac1db1b572af6cc4a040ca357707503f5b
Author:     Mika Kuoppala <mika.kuoppala at linux.intel.com>
AuthorDate: Thu Jun 27 16:54:43 2013 +0300
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Mon Jul 1 18:54:53 2013 +0200

    tests: add i915_sfs_path

    To access 'error_state' through sysfs.

    Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>


output:
i915 sysfs path not found.

Reproduce steps:
----------------------------
1. ./debugfs_reader

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