screen refresh very slow in remote xrdp/Xvnc session

[Phil Kaslo]

When connecting remotely using rdesktop to a server
running Ubuntu 12.04, running xrdp and Xnvc4
(vnc4server) screen refresh is very slow, when say
a terminal window is moved around on the desktop.
 If it is is moved around against the desktop background,
nautilus takes most of the cpu time, as per top.
If the window is moved around in front of say a
firefox window, then firefox takes most
of the cpu time. That is, the process or processes
managing the windows behind the window being moved
 around take a lot of cpu time, and screen refresh is slow.

We do not see this behavior with an standard
vnc session (vncviewer to a vnc4server session
running on the 12.04 server), and not using xrdp.

We do not see this behavior with an rdesktop
connection to an xrdp/Xvnc4 session on a server
running Ubuntu 10.04.

$ lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04

$ apt-cache policy xrdp
xrdp:
  Installed: 0.5.0-2
  Candidate: 0.5.0-2
  Version table:
 *** 0.5.0-2 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
        100 /var/lib/dpkg/status

Let me know if i can provide additional information.

Thanks,
Phil Kaslo
<email address hidden>

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xrdp 0.5.0-2
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Fri May 4 14:46:30 2012
InstallationMedia: Ubuntu 10.04.4 LTS "Lucid Lynx" - Release amd64 (20120214.2)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 SHELL=/bin/bash
SourcePackage: xrdp
UpgradeStatus: Upgraded to precise on 2012-04-30 (4 days ago)
modified.conffile..etc.init.d.xrdp: [modified]
modified.conffile..etc.xrdp.xrdp.ini: [modified]
mtime.conffile..etc.init.d.xrdp: 2012-05-04T09:53:43.972208
mtime.conffile..etc.xrdp.sesman.ini: 2012-03-23T12:49:36.382612
mtime.conffile..etc.xrdp.startwm.sh: 2010-04-01T04:07:57
mtime.conffile..etc.xrdp.xrdp.ini: 2012-05-04T13:10:51.999765

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.