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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 --- - Display shuts off when switching to discrete graphics card"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59785">59785</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>Display shuts off when switching to discrete graphics card
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>critical
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dmallon83@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg CVS
</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=73549" name="attach_73549" title="Git bisect log">attachment 73549</a> <a href="attachment.cgi?id=73549&action=edit" title="Git bisect log">[details]</a></span>
Git bisect log
I have an HP Envy 14 with a muxed intel/radeon graphics setup. After commit
"[ea9d758d6ddb9f4bb9639619100743e8f5fa85a0] drm/i915: push commit_output_state
past the crtc/encoder preparing" I now get a completely black (no backlight)
screen when switching from the intel to the radeon card. I bisected between
3.6.11 and 3.7-rc1 and found the above mentioned commit to be the culprit. I
attempted to revert the commit in the 3.7 tree, but too many other alterations
had been made on top of it to successfully revert.</pre>
</div>
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