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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - sna: (Haswell) X-server freezes when enabling DP at docking station"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71267">71267</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>sna: (Haswell) X-server freezes when enabling DP at docking station
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>consume.noise@gmail.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/intel
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>HW: Lenovo T440s with a Thinkpad Ultra Dock and a Dell U2410
The T440s was at the docking station when powering on.
If I start the X-server, plugin the Monitor to a DP connector at the docking
station and call `xrandr --output DP2 --preferred` the X-server freezes.
(Doesn't happen without the docking station at the mDP connector directly at
the notebook.)
By freeze I mean:
- no cursor movement
- no VT switching
Though the maschine is reachable via ssh:
- X-server ignores `kill -9`
After 2 minutes the following kernel message shows up:
[ 480.195776] INFO: task kworker/0:1:34 blocked for more than 120 seconds.
[ 480.195779] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 480.195781] kworker/0:1 D 0000000000000246 0 34 2 0x00000000
[ 480.195803] Workqueue: events ironlake_panel_vdd_work [i915]
[ 480.195805] ffff880118cebd50 0000000000000046 0000000000014500
ffff880118cebfd8
[ 480.195809] ffff880118cebfd8 0000000000014500 ffff880119218870
ffff88011f214570
[ 480.195812] 0000000000000001 ffff880118cebcd8 ffffffff8109a884
ffff88011f2d4500
[ 480.195816] Call Trace:
[ 480.195822] [<ffffffff8109a884>] ? dequeue_entity+0x144/0x4d0
[ 480.195825] [<ffffffff81099815>] ? set_next_entity+0x95/0xb0
[ 480.195829] [<ffffffff810135a8>] ? __switch_to+0x118/0x4e0
[ 480.195833] [<ffffffff814e1029>] schedule+0x29/0x70
[ 480.195835] [<ffffffff814e1463>] schedule_preempt_disabled+0x23/0x30
[ 480.195839] [<ffffffff814df9d8>] __mutex_lock_slowpath+0x168/0x3b0
[ 480.195843] [<ffffffff814dfc32>] mutex_lock+0x12/0x30
[ 480.195852] [<ffffffffa060a8b5>] ironlake_panel_vdd_work+0x25/0x40 [i915]
[ 480.195855] [<ffffffff8107c6e7>] process_one_work+0x167/0x450
[ 480.195858] [<ffffffff8107d0f1>] worker_thread+0x121/0x3a0
[ 480.195861] [<ffffffff8107cfd0>] ? manage_workers.isra.23+0x2b0/0x2b0
[ 480.195865] [<ffffffff81083960>] kthread+0xc0/0xd0
[ 480.195868] [<ffffffff810838a0>] ? kthread_create_on_node+0x120/0x120
[ 480.195871] [<ffffffff814ea52c>] ret_from_fork+0x7c/0xb0
[ 480.195875] [<ffffffff810838a0>] ? kthread_create_on_node+0x120/0x120
The bug occured with
o kernel 3.10.12
o xorg 1.14.3
o xf86-video-intel 2.11.15
For this test and the following logs it has been reproduced with
o kernel 3.11.6
o xorg 1.14.4
o xf86-video-intel (at git head - dc61705 sna: Use an inplace exchange for
large untiled BO).
A test with kernel 3.12 is in the queue.</pre>
</div>
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