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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression, bisected] vt console display doesn't update with psr"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110303">110303</a>
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<th>Summary</th>
<td>[regression, bisected] vt console display doesn't update with psr
</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>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
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>michal@physics.ubc.ca
</td>
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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>On a Dell XPS13 9343, with kernels newer than 4.17, a vt switch (CTRL-ALT-Fn)
to a console vt has become unusable if psr is enabled. Any console output only
appears after a long delay (or in more recent kernels only after a vt switch
away and back).
I bisected to this commit:
75cbec033c08f6d41c4775784f66ab860d02a6b5
In current drm-tip the problem is still there. If I comment out setting
EDP_PSR_DEBUG_MASK_DISP_REG_WRITE in intel_psr.c
then the vt behaves as expected.
This is a Broadwell machine:
#lspci:
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
I realize that psr isn't exactly supported on BDW - though I've been using it
for years and have never seen the lockups that people complained about that led
to its being turned off by default.</pre>
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