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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Black screen on modesetting with Dell Venue 8 Pro (older firmware) on 3.16.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=82880">82880</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>Black screen on modesetting with Dell Venue 8 Pro (older firmware) on 3.16.x
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>adamw@happyassassin.net
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86 (IA32)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/intel
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=104995" name="attach_104995" title="boot log with drm.debug=15">attachment 104995</a> <a href="attachment.cgi?id=104995&action=edit" title="boot log with drm.debug=15">[details]</a></span>
boot log with drm.debug=15
This is kind of a follow-up to
<a href="https://bugzilla.kernel.org/show_bug.cgi?id=68451">https://bugzilla.kernel.org/show_bug.cgi?id=68451</a> . As of kernel 3.16 support
for the problematic Baytrail tablets with DSI displays is supposed to be
present in the kernel, and some people have reported success. However, I don't
get a working display on my test system, a Dell Venue 8 Pro. The behaviour is
clearly different to how it was, but I get a black screen when modesetting
kicks in.
I am running an older firmware on my V8P - A04 - as updating requires Windows,
and I wiped the Windows install. This may be related to the bug, or not (it's
not entirely clear).
I'm attaching a boot log from kernel 3.16.1 with drm.debug=15 set in the kernel
parameters. The tablet was booting with no external display attached, only the
internal DSI-connected 800x1280 8" panel. The correct resolution seems to be
detected, but the screen blanks as soon as KMS kicks in (very early boot
messages are visible).</pre>
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