<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<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 --- - i965/sna: DPMS off/on freezes GL application"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73469">73469</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>i965/sna: DPMS off/on freezes GL application
</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>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>h.judt@gmx.at
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>This does not occur with UXA, only with SNA:
Steps to reproduce:
1) Start desktop environment. I use compiz-0.8 as window manager.
2) Launch glxgears, keep it running.
3) Issue the following command:
xset dpms force off; sleep 2; xset dpms force on
Expected results:
Monitor switches off and on, nothing else happens.
Actual results:
Monitor switches off and on, glxgears is frozen.
Interestingly, compiz is still responsible when performing above steps.
Now replace glxgears with xscreensaver which can turn off the monitor too, and
the issue gets more severe. I usually have to kill compiz to get a usable X
session again.
On a side note: I often get such messages in dmesg:
[drm] Setting output timings on SDVOB failed
What do they mean? What is SDVOB? Are they harmless?
lspci -v:
00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset
Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0276
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at fe800000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at ec90 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Kernel driver in use: i915
xorg.conf:
Section "Device"
Identifier "Intel"
Driver "intel"
# Output configuration
Option "Monitor-VGA1" "Samsung SyncMaster SA450 VGA"
Option "Monitor-DVI1" "Samsung SyncMaster SA450 DVI"
# Tweaks
Option "AccelMethod" "sna"
Option "PageFlip" "true"
Option "TripleBuffer" "true"
Option "TearFree" "true"
Option "VSync" "true"
EndSection</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>