[Bug 101815] New: [IGT][SKL] Failed to enable DP link training on resume when testing with Chamelium

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101815

            Bug ID: 101815
           Summary: [IGT][SKL] Failed to enable DP link training on resume
                    when testing with Chamelium
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: paul.kocialkowski at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 132728
  --> https://bugs.freedesktop.org/attachment.cgi?id=132728&action=edit
dmesg from 20170717 drm-tip

i915 fails to perform link training on resume with a Chamelium attached to the
DP connector. This is triggered by launching one of the DP suspend/resume IGT
chamelium tests such as dp-hpd-after-suspend or dp-edid-change-during-suspend.

The error appears to be: dp_aux_ch timeout status 0x7d4003ff (full dmesg from
today's drm-tip is attached).

Information about the setup:
* Kernel: drm-tip 0ea81ff8a340aa1f2bc863f4c8e631542e47c98e
* Distro: Arch Linux (NOT using the distro's kernel)
* CPU: i5-6600K

Ironically, it makes the IGT test pass because a hotplug uevent is generated
because of link training failure.

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