Random display glitches

Binary package hint: compiz

The attached screenshots show corrupted display i'm encountering randomly when using my computer. Frequency of glitches is high, especially when using epiphany, or by cycling the window menus.

My setup used to work fine a few weeks ago.

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE] (prog-if 00 [VGA controller])

Section "Device"
 Identifier "ATI Technologies, Inc. Radeon RV100 QY [Radeon 7000/VE]"
 Driver "radeon"
 Option "AGPSize" "64"
EndSection

manu@hobbes:~$ dpkg -l "*compiz*"
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Nom Version Description
+++-==========================-==========================-====================================================================
ii compiz 1:0.7.2-0ubuntu2 OpenGL window and compositing manager
un compiz-compcomm-plugins-ma <néant> (aucune description n'est disponible)
ii compiz-core 1:0.7.2-0ubuntu2 OpenGL window and compositing manager
un compiz-extra <néant> (aucune description n'est disponible)
ii compiz-fusion-plugins-extr 0.7.2-0ubuntu1 Collection of extra plugins from OpenCompositing for Compiz
ii compiz-fusion-plugins-main 0.7.2-0ubuntu1 Collection of plugins from OpenCompositing for Compiz
ii compiz-gnome 1:0.7.2-0ubuntu2 OpenGL window and compositing manager - GNOME window decorator
rc compiz-gtk 1:0.3.6-1ubuntu13 OpenGL window and compositing manager - Gtk window decorator
ii compiz-plugins 1:0.7.2-0ubuntu2 OpenGL window and compositing manager - plugins
ii compizconfig-backend-gconf 0.7.2-0ubuntu1 Settings library for plugins - OpenCompositing Project
ii compizconfig-settings-mana 0.7.2-0ubuntu2 Compiz configuration settings manager
pn libcompizconfig-backend-gc <néant> (aucune description n'est disponible)
ii libcompizconfig0 0.7.2-0ubuntu1 Settings library for plugins - OpenCompositing Project
ii python-compizconfig 0.7.2-0ubuntu1 Compiz configuration system bindings