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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [BDW-Y Bisected ] eDP display not light after entering the kernel."
href="https://bugs.freedesktop.org/show_bug.cgi?id=79610">79610</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BDW-Y Bisected ] eDP display not light after entering the kernel.
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lei.a.liu@intel.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=100376" name="attach_100376" title="dmesg">attachment 100376</a> <a href="attachment.cgi?id=100376&action=edit" title="dmesg">[details]</a></span>
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 <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
AuthorDate: Mon Mar 3 11:18:10 2014 +0100
Commit: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
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 <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
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: <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [hsw DP] Ubuntu 12.04 unable to use external monitor through edock"
href="show_bug.cgi?id=73694">https://bugs.freedesktop.org/show_bug.cgi?id=73694</a>
Cc: <a href="mailto:peter@colberg.org">peter@colberg.org</a>
Cc: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Tested-by: Itai BEN YAACOV <<a href="mailto:candeb@free.fr">candeb@free.fr</a>>
Tested-by: David En <<a href="mailto:d.engraf@arcor.de">d.engraf@arcor.de</a>>
Reported-and-Tested-by: Marcus Bergner <<a href="mailto:marcusbergner@gmail.com">marcusbergner@gmail.com</a>>
Reviewed-by: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>>
Acked-by: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>></pre>
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