Suspend seems to have two issues on the Latitude D820, Nvidia drivers
and Compiz running.

The workaround is as follows:

1) sudo gedit /etc/X11/xorg.conf and make sure the following lines are
there or match:

Section "Device"
        Identifier      "nVidia Corporation G72M [GeForce Go 7400]"
        Driver          "nvidia"
        Busid           "PCI:1:0:0"
        Option          "UseEDIDDpi"            "False"
        Option          "AddARGBVisuals"        "True"
        Option          "AddARGBGLXVisuals"     "True"
        Option          "NoLogo"                "True"
        Option          "NvAGP"                 "1"
EndSection

2) sudo gedit /etc/default/acpi-support and make sure the following are
changed:

SAVE_VBE_STATE=false #ex-true
POST_VIDEO=false #ex-true
USE_DPMS=false #ex-true
LOCK_SCREEN=false #ex-true

3) gedit /etc/acpi/suspend.d/03-kill-compiz.sh

killall compiz.real

4) chmod 755 /etc/acpi/suspend.d/03-kill-compiz.sh

5) gedit /etc/acpit/resume.d/99-restore-compiz.sh

su - <your-user-name> -c "compiz --replace gconf"

6) chmod 755 /etc/acpi/resume.d/99-restore-compiz.sh

And that should do it. Of course, your could just disable desktop
affects, but that wouldn't be any fun.

-- 
Suspend to ram erratic latest gutsy 09/17/2007
https://bugs.launchpad.net/bugs/140590
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