[Bug 85123] New: [BDW] FBC is not actually working after start gnome-sesstion desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85123

            Bug ID: 85123
           Summary: [BDW] FBC is not actually working after start
                    gnome-sesstion desktop
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: wendy.wang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 107974
  --> https://bugs.freedesktop.org/attachment.cgi?id=107974&action=edit
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 at x-bdw05:~# echo 1 > /sys/kernel/debug/dri/0/i915_fbc_false_color
root at 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.

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