[Bug 92469] New: eDP kernel warning while resuming

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92469

            Bug ID: 92469
           Summary: eDP kernel warning while resuming
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: corax.2.6 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118884
  --> https://bugs.freedesktop.org/attachment.cgi?id=118884&action=edit
dmesg 3.14.52 (initcall_debug dri.debug=0xe) - successful resume with warnings

Using 3.14 or less (here, 3.14.52-1-lts), I get exactly 2 "eDP powered off
while attempting aux channel communication." warnings whenever I resume from
hibernation. These warnings seem to be harmless as there is no noticeable
issue.

Starting with 3.16 (up until the latest 4.2), these warnings disappear. But,
quite often (mostly when the saved image is big), resuming fails (freeze on a
black screen with or without a cursor). I have tried various things from [1]
(notably setting hibernation mode to shutdown), but the issue is always there.

Distribution: Arch Linux
Machine: Clevo W350ST (Optimus Intel Core i7-4700MQ (HD Graphics 4600) + NVIDIA
GTX 765M)

[1] :
https://01.org/blogs/rzhang/2015/best-practice-debug-linux-suspend/hibernate-issues1

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