Comment 31 for bug 61746

I had the same problem with a dell latitude C640 with
ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]

X crashed when I closed the screen. This happened under Dapper with xorg-air but not with the default x server. From Edguy this happened everytime, but since I added the :
Section "ServerFlags"
   Option "NoPM"
EndSection
the problem doesn't appear anymore

/var/log/messages :
Nov 6 02:06:16 latitude gnome-power-manager: (kjo) Extinction de l'écran (DPMS) car L'écran du portable a été rabattu (branché sur secteur)
Nov 6 02:06:16 latitude kernel: [ 313.599000] video bus notify
Nov 6 02:06:16 latitude gconfd (kjo-5081): Réception du signal 15, arrêt correct
Nov 6 02:06:16 latitude gconfd (kjo-5081): Sortie
Nov 6 02:06:18 latitude kernel: [ 316.327000] mtrr: 0xe0000000,0x8000000 overlaps existing 0xe0000000,0x2000000
Nov 6 02:06:18 latitude last message repeated 2 times
Nov 6 02:06:18 latitude kernel: [ 316.327000] agpgart: Found an AGP 2.0 compliant device at 0000:00:00.0.
Nov 6 02:06:18 latitude kernel: [ 316.327000] agpgart: Putting AGP V2 device at 0000:00:00.0 into 1x mode
Nov 6 02:06:18 latitude kernel: [ 316.328000] agpgart: Putting AGP V2 device at 0000:01:00.0 into 1x mode
Nov 6 02:06:18 latitude kernel: [ 316.544000] [drm] Setting GART location based on new memory map
Nov 6 02:06:18 latitude kernel: [ 316.544000] [drm] writeback test succeeded in 1 usecs