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[KML <1321008@xxxxxxxxxxxxxxxxxx>]

I worked arround the problem by running rdesktop with the -b flag - Info
from rdesktop man: "-b : Force the server to send screen updates as
bitmaps rather than using higher-level drawing operations."

Since i did this i havn't had this problem even once, but it takes a
heavy toll on the bandwidth, and on slow connections this is far from
ideal.

Hope you find a fix.

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https://bugs.launchpad.net/bugs/1321008

Title:
  Screen(s) froze in Gnome-shell.

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  Screen(s) froze in Gnome-shell when i was working in rdesktop.

  The laptop (Dell E6520) was seated in a dock with 2 screens attached.
  Both the screen with rdesktop and the one without froze, and i was
  only able to move the mouse-pointer.

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-core 2:1.15.1-0ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Mon May 19 14:29:58 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExecutablePath: /usr/bin/Xorg
  ExecutableTimestamp: 1397655517
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0494]
  InstallationDate: Installed on 2014-05-16 (2 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: Dell Inc. Latitude E6520
  ProcCmdline: /usr/bin/X :0 -background none -verbose -auth /var/run/gdm/auth-for-gdm-TlE83H/database -seat seat0 -nolisten tcp vt7
  ProcCwd: /etc/X11
  ProcEnviron:
   LANG=en_US.UTF-8
   TERM=linux
   LANGUAGE=en_US:en
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fafcc13aa10 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
   malloc_printerr (ptr=<optimized out>, str=0x7fafcc13aaf8 "double free or corruption (!prev)", action=1) at malloc.c:4996
   _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
   ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
   ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
  Title: Xorg crashed with SIGABRT in __libc_message()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  dmi.bios.date: 02/28/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0NVF5K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd02/28/2012:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0NVF5K:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6520
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Mon May 19 14:30:10 2014
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16450
   vendor                                     DEL
  xserver.version: 2:1.15.1-0ubuntu2

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