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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95176">95176</a>
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<th>Summary</th>
<td>LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</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>
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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
</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>calvin.walton@kepstin.ca
</td>
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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>
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<div>
<pre>Hi,
Following updating to 4.6-rc kernels (with psr enabled by default), the screen
on my ThinkPad T440p (Intel i5-4330M, igpu) has started to flicker
occasionally. The screen will go black for around 1-2 frames during times of
low activity (it immediately returns to showing the screen again afterwards).
Using the i915.enable_psr=2 or i915.enable_psr=3 makes no difference; the
screen flickers occur with both settings. Only setting enable_psr=0 stops the
issue completely.
I'm running GNOME 3.20 on Wayland; haven't tried X11.
i915_edp_psr_status: (with enable_psr=-1)
Sink_Support: yes
Source_OK: yes
Enabled: yes
Active: yes
Busy frontbuffer bits: 0x000
Re-enable work scheduled: no
Main link in standby mode: no
HW Enabled & Active bit: yes
Performance_Counter: 2397286
PCI ids:
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: Lenovo ThinkPad T440p [17aa:220e]
I haven't yet tried getting the drm debug logs or running the intel-gpu-tools
psr test case; I'll do that later today and attach the results here.</pre>
</div>
</p>
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