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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 - [i915] driver crashes with dual 4k monitors on Intel HD 520"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99908">99908</a>
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<th>Summary</th>
<td>[i915] driver crashes with dual 4k monitors on Intel HD 520
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</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>phil@phord.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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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=129834" name="attach_129834" title="xrandr --verbose">attachment 129834</a> <a href="attachment.cgi?id=129834&action=edit" title="xrandr --verbose">[details]</a></span>
xrandr --verbose
Bug description:
My laptop locks up hard (Alt-SysRq-B does not work) when I enable video modes
3840x2160 on both monitors and desktop is extended, not mirrored. If I use
3840x2160 on one monitor and 1920x1080 on the other, it seems stable. When I
tried 2560x1440 on the 2nd monitor (the native resolution of my built-in laptop
display) it also locked up.
It locked up when I tried to use only one external monitor in 4k mode with my
laptop screen in native resolution (2560x1440), but I did not experiment with
that mode much, so I don't have as much specific information about it.
The crash is very reliable and immediate.
I tried some 4.10 kernel flavors, but I failed when trying to install drm-tip
for testing with latest code.
System environment:
-- chipset: Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz
-- system architecture: 64-bit
-- xf86-video-intel:
-- xserver: xorg-server 2:1.18.4-1ubuntu6
-- mesa:
-- libdrm: 2.4.70-1
-- kernel: 4.8.0-37-generic
-- Linux distribution: Ubuntu 16.10
-- Machine or mobo model: Lenovo Carbon X1
-- Display connector: HDMI on OnePort dock
Reproducing steps:
Enable extended desktop on two monitors in 3840x2160 resolution.
Additional info:
$ uname -m ; uname -r
x86_64
4.8.0-37-generic
Lenovo Thinkpad Carbon X1
description: Notebook
product: 20FB005LUS (LENOVO_MT_20FB_BU_Think_FM_ThinkPad X1 Carbon 4th)
vendor: LENOVO
version: ThinkPad X1 Carbon 4th
width: 64 bits
capabilities: smbios-2.8 dmi-2.8 smp vsyscall32
description: Motherboard
product: 20FB005LUS
vendor: LENOVO
physical id: 0
version: SDK0J40697 WIN</pre>
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