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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Latitude 7400 2-in-1: intermittent screen freezes (i915)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111500">111500</a>
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<th>Summary</th>
<td>Latitude 7400 2-in-1: intermittent screen freezes (i915)
</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>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>not set
</td>
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<th>Priority</th>
<td>not set
</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>leho@kraav.com
</td>
</tr>
<tr>
<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>
<p>
<div>
<pre>(Originally at <a href="https://bugzilla.kernel.org/show_bug.cgi?id=204701">https://bugzilla.kernel.org/show_bug.cgi?id=204701</a>)
Hardware: Dell Latitude 7400 2-in-1 with Wacom 0x48C9 touchscreen
Seemingly at random, this Coffeelake gen9 chip graphics engine is
intermittently freezing on me. Mouse cursor has been in a Firefox web browser
window at least on a few occurrences.
External screen, connected via Type C, also froze.
Kernel stays alive, because I could still reboot via magic sysrq and REISUB.
After rebooting, checking `journalctl -b -1` reveals zero error messages from
Xorg, or kernel.
It feels like i915 might be involved with maybe one of the performance
parameters (dc, psr, fbc, rc6, etc) being incompatible with this relatively new
hardware.
There's also another known bug with this (touch)screen at designware i2c level
<a href="https://bugzilla.kernel.org/show_bug.cgi?id=204063">https://bugzilla.kernel.org/show_bug.cgi?id=204063</a>
Of course, this might just be faulty hardware, but setting up testing a Win10
installation here is a large challenge. I'd like to exclude Linux software
stack issues first.
====
Q: what kernel or i915 paramaters would you recommend I test first, to see if
freezes can go away?
====
PS I've run this same OS installation on DELL 7480 (KBL) for 2 years without
any video issues, so it's either some new gen hardware incompatibility or
broken hardware.</pre>
</div>
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