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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 - kernel 4.6 regression: PSR causes screen to flash"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96736">96736</a>
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<th>Summary</th>
<td>kernel 4.6 regression: PSR causes screen to flash
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
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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>xavierb@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=124786" name="attach_124786" title="dmesg drm.debug=0xe">attachment 124786</a> <a href="attachment.cgi?id=124786&action=edit" title="dmesg drm.debug=0xe">[details]</a></span>
dmesg drm.debug=0xe
(maybe dup of #96704)
Since updating to linux 4.6, the screen flashes (to black screen).
(tested linux mainline 4.7 git, problem still occurs)
The problems appears shortly after booting the kernel, before starting X. (and
persits forever)
if the screen is updated continuously (say, by moving the mouse or running
glxgear), the flashing stop.
git bisect points to 9b58e352b463f2f096d699d47b1c4c57879b617f
drm/i915: Enable PSR by default on Haswell and Broadwell.
Additional Information
======================
The system is Toshiba Satellite P70-B11-R.
When booting with "i915.enable_psr=0" the problem goes away.
And neither "i915.enable_psr=2" nor "i915.enable_psr=3" fix the problem - it
does seem the flashing frequency is a bit different, though.
Steps To Reproduce
==================
Just start the system. I'm using gnome, but the screen flahsing can be seen
even in console before gdm starts.</pre>
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