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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BYT/BSW] eDP black screen when backlight is set over update_status path"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86504">86504</a>
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<th>Summary</th>
<td>[BYT/BSW] eDP black screen when backlight is set over update_status path
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>rodrigo.vivi@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=109785" name="attach_109785" title="dmesg">attachment 109785</a> <a href="attachment.cgi?id=109785&action=edit" title="dmesg">[details]</a></span>
dmesg
xset dpms force off
leads to a frozen blank screen without any way to recover from it.
It happens that on update_status path backlight is disabled before the regular
path and it causes this issue.
If we avoid "&= ~EDP_BLC_ENABLE;" when coming from backlight_ops.update_status
path everything works correctly as expected.
For a long time I believed that it was a PSR issue, but when fighting against
it I noticed it was happening 100% of the time even with PSR disabled.
So I just reproduced and collected log of it on today's nightly that doesn't
have PSR for VLV merged yet.</pre>
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