<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - MST backport to 3.16 crashes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89187">89187</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>MST backport to 3.16 crashes
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr>
<tr>
<th>Version</th>
<td>git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dariusz.gadomski@canonical.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=113571" name="attach_113571" title="Kernel config used">attachment 113571</a> <a href="attachment.cgi?id=113571&action=edit" title="Kernel config used">[details]</a></span>
Kernel config used
I have built kernel from sources [1] containing David Airlie's MST i915
backport for the 3.16 kernel. I have used Ubuntu config (attached).
After connecting daisy-chained monitors (Dell U2414H) I get the following stack
trace:
[ 38.186428] CPU: 1 PID: 2395 Comm: Xorg Tainted: G W OE 3.16.0+ #1
[ 38.186429] Hardware name: Dell Inc. XPS 15 9530/XPS 15 9530, BIOS A07
10/15/2014
[ 38.186430] 0000000000000009 ffff8803f83378c8 ffffffff82759c3f
ffff8803f8337910
[ 38.186433] ffff8803f8337900 ffffffff8206d97d ffff880412735058
ffff8804127356f8
[ 38.186435] ffff880414866800 ffff880412735000 ffff880414866b40
ffff8803f8337960
[ 38.186437] Call Trace:
[ 38.186440] [<ffffffff82759c3f>] dump_stack+0x45/0x56
[ 38.186443] [<ffffffff8206d97d>] warn_slowpath_common+0x7d/0xa0
[ 38.186445] [<ffffffff8206d9ec>] warn_slowpath_fmt+0x4c/0x50
[ 38.186456] [<ffffffffc064cd63>] check_crtc_state+0x703/0xd70 [i915]
[ 38.186469] [<ffffffffc065b24f>] intel_modeset_check_state+0x28f/0x7a0
[i915]
[ 38.186479] [<ffffffffc065b7f5>] intel_set_mode+0x25/0x30 [i915]
[ 38.186490] [<ffffffffc065c73c>] intel_crtc_set_config+0x92c/0xe00 [i915]
[ 38.186499] [<ffffffffc042e421>] drm_mode_set_config_internal+0x61/0xe0
[drm]
[ 38.186508] [<ffffffffc0431f99>] drm_mode_setcrtc+0xd9/0x590 [drm]
[ 38.186515] [<ffffffffc04229cc>] drm_ioctl+0x1ec/0x660 [drm]
[ 38.186519] [<ffffffff821e4e10>] do_vfs_ioctl+0x2e0/0x4c0
[ 38.186521] [<ffffffff820a4c84>] ? vtime_account_user+0x54/0x60
[ 38.186524] [<ffffffff821e5071>] SyS_ioctl+0x81/0xa0
[ 38.186526] [<ffffffff827627bf>] tracesys+0xe1/0xe6
[ 38.186528] ---[ end trace 8b3dd31c3c6e8ccc ]---
Attaching full dmesg and another dmesg with drm.debug=1 passed on the kernel
command line.
I am using intel drivers built from git available here [2] (version
147e190d1e18d3ac6dc23aa4e493eec28aa75d1d).
[1] <a href="http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-i915-mst-v3.16">http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-i915-mst-v3.16</a>
[2] <a href="https://launchpad.net/~xorg-edgers/+archive/ubuntu/ppa">https://launchpad.net/~xorg-edgers/+archive/ubuntu/ppa</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
</ul>
</body>
</html>