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[Pkg-xfce-devel] Bug#640842: xfwm4: Windows cease to respond to the mouse and cycling among windows triggers a beep

Package: xfwm4
Version: 4.6.2-1
Severity: important

Sometimes happens that once initiated an XFCE session, the windows become
mostly insensitive to the mouse: they cannot be selected by clicking on
them, they cannot be moved around, the mouse does not recognise the 
windows' boundaries, etc. So, essentially, the mouse becomes useless.
There's a puzzling exception to this behaviour: the mouse does recognise 
the "close" buttons on the browser *tabs*, so the tabs can be closed (even 
though they cannot be selected!).

These issues are always accompanied by unoperativity of the window
cycling: pressing alt + tab triggers a beep, and nothing more.

There are several other issues that I have observed only a couple of
times (of a total of four): the xfce4 panel ceases to respond to the
mouse, only the workspace selector ceases to respond, and (once) the
keyboard was blocked and the whole graphical environment was rendered

Unfortunately, I have not suceeded in identifying the cause for these
behaviours. They just seem to happen 'sometimes' (roughly once every four 
boots in the last two weeks). I have never used debugging symbols, so maybe 
it is possible to figure it out; if there's a protocol that can yield useful 
information, please tell me where to learn about it and I'll do my best.

-- System Information:
Debian Release: 6.0.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages xfwm4 depends on:
ii  libc6                  2.11.2-10         Embedded GNU C Library: Shared lib
ii  libdbus-glib-1-2       0.88-2.1          simple interprocess messaging syst
ii  libglade2-0            1:2.6.4-1         library to load .glade files at ru
ii  libglib2.0-0           2.24.2-1          The GLib library of C routines
ii  libgtk2.0-0            2.20.1-2          The GTK+ graphical user interface 
ii  libpango1.0-0          1.28.3-1+squeeze2 Layout and rendering of internatio
ii  libstartup-notificatio 0.10-1            library for program launch feedbac
ii  libwnck22              2.30.4-2          Window Navigator Construction Kit 
ii  libx11-6               2:1.3.3-4         X11 client-side library
ii  libxcomposite1         1:0.4.2-1         X11 Composite extension library
ii  libxdamage1            1:1.1.3-1         X11 damaged region extension libra
ii  libxext6               2:1.1.2-1         X11 miscellaneous extension librar
ii  libxfce4util4          4.6.2-1           Utility functions library for Xfce
ii  libxfcegui4-4          4.6.4-1           Basic GUI C functions for Xfce4
ii  libxfconf-0-2          4.6.2-1           Client library for Xfce4 configure
ii  libxfixes3             1:4.0.5-1         X11 miscellaneous 'fixes' extensio
ii  libxrandr2             2:1.3.0-3         X11 RandR extension library
ii  libxrender1            1:0.9.6-1         X Rendering Extension client libra

Versions of packages xfwm4 recommends:
ii  librsvg2-common               2.26.3-1   SAX-based renderer library for SVG
ii  xfwm4-themes                  4.6.0-2    Theme files for xfwm4

Versions of packages xfwm4 suggests:
ii  xfce4                         4.6.2      Meta-package for the Xfce Lightwei

-- no debconf information

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