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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - After commit f21a21983ef13a, the display is turned off"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96675">96675</a>
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<th>Summary</th>
<td>After commit f21a21983ef13a, the display is turned off
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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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>medium
</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>larry.finger@lwfinger.net
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=124717" name="attach_124717" title="Output of dmesg with drm.debug=3 taken AFTER the faulty commit">attachment 124717</a> <a href="attachment.cgi?id=124717&action=edit" title="Output of dmesg with drm.debug=3 taken AFTER the faulty commit">[details]</a></span>
Output of dmesg with drm.debug=3 taken AFTER the faulty commit
As soon as kernel 4.7-rcX is started, the display is blanked, and it is never
turned on again. This problem was bisected to commit
f21a21983ef13a031250c4c3f6018e29a549d0f1
("drm/i915: Splitting intel_dp_detect"). The adapter in question is the
integrated graphics controller on a Toshiba Tecra A50 laptop. The output of
"lspci -nnv" for that controller is as follows:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA
controller])
Subsystem: Toshiba America Info Systems Device [1179:0002]
Flags: bus master, fast devsel, latency 0, IRQ 27
Memory at e0000000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915
Disabling i915 with a "nomodeset" on the kernel command line allows the system
to boot normally.</pre>
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