system hangs after closing lid of laptop

[Shantanu]

when i close lid and open it again system hangs frequently . . . it shows high cpu use and hangs everything . . .

ProblemType: Bug
Architecture: i386
Date: Sat Dec 5 09:23:47 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
NonfreeKernelModules: nvidia
Package: firefox-3.5 3.5.5+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANG=en_IN
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-15-generic i686
XsessionErrors:
 (gnome-settings-daemon:1912): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:1912): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (polkit-gnome-authentication-agent-1:1961): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (nautilus:1948): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed

[Serge Hallyn (serge-hallyn)]

Please reply if this is still an issue on a supported release.