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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW] FBC is not actually working after start gnome-sesstion desktop"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85123">85123</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BDW] FBC is not actually working after start gnome-sesstion desktop
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>wendy.wang@intel.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>Created <span class=""><a href="attachment.cgi?id=107974" name="attach_107974" title="dmesg log file for FBC fail">attachment 107974</a> <a href="attachment.cgi?id=107974&action=edit" title="dmesg log file for FBC fail">[details]</a></span>
dmesg log file for FBC fail
==System Environment==
--------------------------
Regression: NO.
Non-working platforms: BDW
==kernel==
origin/drm-intel-nightly: 1361e359ee657c6dbc9528357e40f91a004c6abe(fails)
drm-intel-nightly: 2014y-10m-16d-12h-06m-56s UTC integration manifest
origin/drm-intel-next-queued: fff95501f2095fa8a9dbd7e177bbf642d241b2fe(fails)
drm/i915: intel_backlight scale() math WA
==Bug detailed description==
-----------------------------
BDW FBC is working with x window, but fail with gnome-session desktop lauch
Reproduce steps:
1. Enable FBC in kernel with parameter: i915.enable_fbc=1
2. Boot system and start x
3. echo 1 > /sys/kernel/debug/dri/0/i915_fbc_false_color, BDW show red screen
4. start gnome-session: BDW show normal color(white) x windows screen, and
background show normal desktop screen, no special color.
And observed With below message in terminal:
root@x-bdw05:~# echo 1 > /sys/kernel/debug/dri/0/i915_fbc_false_color
root@x-bdw05:~# screen
compiz (core) - Info: Starting plugin: decor
compiz (core) - Info: Loading plugin: grid
compiz (core) - Info: Starting plugin: grid
compiz (core) - Info: Loading plugin: resize
compiz (core) - Info: Starting plugin: resize
compiz (core) - Info: Loading plugin: commands
compiz (core) - Info: Starting plugin: commands
compiz (core) - Info: Loading plugin: vpswitch
compiz (core) - Info: Starting plugin: vpswitch
compiz (core) - Info: Loading plugin: gnomecompat
compiz (core) - Info: Starting plugin: gnomecompat
compiz (core) - Info: Loading plugin: snap
compiz (core) - Info: Starting plugin: snap
compiz (core) - Info: Loading plugin: wall
compiz (core) - Info: Starting plugin: wall
compiz (core) - Info: Loading plugin: move
compiz (core) - Info: Starting plugin: move
compiz (core) - Info: Loading plugin: mousepoll
compiz (core) - Info: Starting plugin: mousepoll
compiz (core) - Info: Loading plugin: place
compiz (core) - Info: Starting plugin: place
compiz (core) - Info: Loading plugin: regex
compiz (core) - Info: Starting plugin: regex
compiz (core) - Info: Loading plugin: imgpng
compiz (core) - Info: Starting plugin: imgpng
compiz (core) - Info: Loading plugin: session
compiz (core) - Info: Starting plugin: session
I/O warning : failed to load external entity
"/root/.compiz/session/10dd69fc06b415c34141355958221060900000046560001"
compiz (core) - Info: Loading plugin: animation
compiz (core) - Info: Starting plugin: animation
compiz (core) - Info: Loading plugin: expo
compiz (core) - Info: Starting plugin: expo
compiz (core) - Info: Loading plugin: fade
compiz (core) - Info: Starting plugin: fade
compiz (core) - Info: Loading plugin: workarounds
compiz (core) - Info: Starting plugin: workarounds
compiz (core) - Info: Loading plugin: ezoom
compiz (core) - Info: Starting plugin: ezoom
compiz (core) - Info: Loading plugin: scale
compiz (core) - Info: Starting plugin: scale
** Message: applet now removed from the notification area
/bin/sh: 1: /usr/bin/gtk-window-decorator: not found
(nautilus:4842): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT
(object)' failed
(nautilus:4842): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT
(object)' failed
** Message: using fallback from indicator to GtkStatusIcon
dmesg-fbcfail.log attached.</pre>
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