[Bug 79610] New: [BDW-Y Bisected ] eDP display not light after entering the kernel.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79610

          Priority: medium
            Bug ID: 79610
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW-Y Bisected ] eDP display not light after entering
                    the kernel.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lei.a.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 100376
  --> https://bugs.freedesktop.org/attachment.cgi?id=100376&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 

Non-working platforms: BDW-Y

==kernel==
--------------------------
origin/drm-intel-nightly: 085391259463f3bda367fc3e078504d83cd8dc0e(works)
    drm-intel-nightly: 2014y-05m-29d-23h-55m-55s integration manifest
origin/drm-intel-next-queued: 192155025197cc4765702a180904c3b62c152b7a(fails)
    drm/i915: Drop locking around fbdev-fb in debugfs   
origin/drm-intel-fixes: d23db88c3ab233daed18709e3a24d6c95344117f(works)
    drm/i915: Prevent negative relocation deltas from wrapping

==Bug detailed description==
-----------------------------
Booting with eDP, monitor can't be lighted up after entering the kernel. I
can't find a good commit on -next-queued

==Reproduce steps==
---------------------------- 
Boot with eDP

==Bisect results==
----------------------------
Bisect shows: 38aecea0ccbb909d635619cba22f1891e589b434 is the first bad commit:

commit 38aecea0ccbb909d635619cba22f1891e589b434
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Mon Mar 3 11:18:10 2014 +0100
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed Mar 5 21:30:42 2014 +0100

    drm/i915: reverse dp link param selection, prefer fast over wide again

    ... it's this time of the year again. Originally we've frobbed this to
    fix up some regressions, but maybe our DP code improved sufficiently
    now that we can dare to do again what the spec recommends.

    This reverts

    commit 2514bc510d0c3aadcc5204056bb440fa36845147
    Author: Jesse Barnes <jbarnes at virtuousgeek.org>
    Date:   Thu Jun 21 15:13:50 2012 -0700

        drm/i915: prefer wide & slow to fast & narrow in DP configs

    I'm pretty sure I'll regret this patch, but otoh I expect we won't
    make progress here without poking the devil occasionally.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73694
    Cc: peter at colberg.org
    Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
    Tested-by: Itai BEN YAACOV <candeb at free.fr>
    Tested-by: David En <d.engraf at arcor.de>
    Reported-and-Tested-by: Marcus Bergner <marcusbergner at gmail.com>
    Reviewed-by: Jani Nikula <jani.nikula at intel.com>
    Acked-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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