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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL Bisected] eDP can not be lighted up after entering kernel"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89554">89554</a>
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<th>Summary</th>
<td>[SKL Bisected] eDP can not be lighted up after entering kernel
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>critical
</td>
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<th>Priority</th>
<td>highest
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>yex.tian@intel.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=114247" name="attach_114247" title="dmesg with drm.debug info">attachment 114247</a> <a href="attachment.cgi?id=114247&action=edit" title="dmesg with drm.debug info">[details]</a></span>
dmesg with drm.debug info
System Environment:
-----------------------------------------------------
Platform: SKL with new version CPU
Regression: Yes
==Kernel==
--------------------------------------------------
commit 3c0401df292f3cdf60435342a05bee3efb099ca0
Author: Ander Conselvan de Oliveira <<a href="mailto:ander.conselvan.de.oliveira@intel.com">ander.conselvan.de.oliveira@intel.com</a>>
Date: Wed Mar 11 13:35:43 2015 +0200
drm/i915: Simplify the way BC bifurcation state consistency is kept
Bug detailed description:
--------------------------------------------------
Edp display show blank screen with backlight is ON after entering kernel, while
SSH still working.
If connect mini-DP, mini-DP can display normally.
It’s kernel regression, Bisect shows the first bad commit is
(next-queued)7ad14a29f005.
commit 7ad14a29f0051ba4b631fb8ab3013e4577ffee95
Author: Sonika Jindal <<a href="mailto:sonika.jindal@intel.com">sonika.jindal@intel.com</a>>
AuthorDate: Wed Feb 25 10:29:12 2015 +0530
Commit: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
CommitDate: Wed Feb 25 16:06:42 2015 +0100
drm/i915/skl: Add support for edp1.4 low vswing
Based upon vbt's vswing preemph settings value select the appropriate
translations for edp.
Please see the dmesg info.
Reproduce steps:
----------------------------
1, Boot up system with edp display connected</pre>
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