Having the same issue here with Xubuntu 9.10 on a Thinkpad T42 with graphics card ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]. I don't believe the issue is caused by the graphics card. This issue affects gnome-system-monitor and the notifications displayed by notify-osd. Had to replace notify-osd with xfce4-notifyd to view the notifications.
Having the same issue here with Xubuntu 9.10 on a Thinkpad T42 with graphics card ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]. I don't believe the issue is caused by the graphics card. This issue affects gnome-system- monitor and the notifications displayed by notify-osd. Had to replace notify-osd with xfce4-notifyd to view the notifications.