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problema com o xephyr

bom dia, configurei minha maquina pra atuar como um sistema multiseat
( uma maquina com 4 monitores, teclados e mouse )
esses sistema tem 4 placas de videos e usei o xephyr seguindo o seguinte
tutorial
http://netpatia.blogspot.com/2006/09/multiseat-computer-with-ubuntu.html

e em anexo tá o script q usei pra chama o X pelo gdm (Xephyr.sh) e os
demais arquivos de configuração.
tudo estava funcionando bem até q conforme os usuários estão usando o
gnome o gdm reseta, encerrando o X e voltando pra tela inicial de login
do gdm.
Nao aparece nenhum log de erro /var/log/Xorg.0.log e nem no syslog.
nao consigo entender o motivo disso, as vezes demora 30 minutos pra
acontecer, ou menos. A config da minha máquina é:
 AMD Sempron 1833.216 MHz
 1 GB de ram
 placa ASUS com 5 slot PCI e um AGP
 placas de video: 
nVidia Corporation NV5M64 [RIVA TNT2 Model 64/Model 64 Pro] AGP
Trident Microsystems TGUI 9660/938x/968x PCI
S3 Inc. ViRGE/DX or /GX PCI
Trident Microsystems TGUI 9660/938x/968x
Agradeço a ajuda!

Attachment: Xephyr.sh
Description: application/shellscript


[servers]
0=Hardware
1=Xephyr1
2=Xephyr2
3=Xephyr3
4=Xephyr4

[server-Hardware]
name=Hardware
command=/usr/X11R6/bin/X -ac -br
handled=false
flexible=false

[server-Xephyr1]
name=Xephyr1
command=/usr/sbin/Xephyr.sh -display :0.0 -br -xauthority /var/lib/gdm/:0.Xauth -geometry 1024x768+0+0 -kbdphys usb-0000:00:10.2-1/input0 -mousephys usb-0000:00:10.2-2/input0 -use-evdev 
handled=true
flexible=false

[server-Xephyr2]
name=Xephyr2
command=/usr/sbin/Xephyr.sh -display :0.1 -br -xauthority /var/lib/gdm/:0.Xauth -geometry 1024x768+0+0 -kbdphys usb-0000:00:10.3-4.3/input0 -mousephys usb-0000:00:10.0-1/input0 -use-evdev 
handled=true
flexible=false

[server-Xephyr3]
name=Xephyr3
command=/usr/sbin/Xephyr.sh -display :0.2 -br -xauthority /var/lib/gdm/:0.Xauth -geometry 1024x768+0+0 -kbdphys usb-0000:00:10.3-4.2/input0 -mousephys usb-0000:00:10.0-2/input0 -use-evdev 
handled=true
flexible=false

[server-Xephyr4]
name=Xephyr4
command=/usr/sbin/Xephyr.sh -display :0.3 -br -xauthority /var/lib/gdm/:0.Xauth -geometry 1024x768+0+0 -kbdphys usb-0000:00:10.3-4.4/input0 -mousephys usb-0000:00:10.1-1/input0 -use-evdev
handled=true
flexible=false

[greeter]
GraphicalTheme=SimpleGreeter

Section "ServerLayout"
	Identifier	"layout"
	Screen		"screen0"
	Screen		"screen1"	Below	"screen0"
	Screen		"screen2"	Below	"screen1"
	Screen		"screen3"	Below	"screen2"
	InputDevice	"keyboard0"
	InputDevice     "mouse0"
EndSection

Section "Device"
	Identifier  "device0"
	Driver      "nv"
	VendorName  "nVidia Corporation"
	BoardName   "NV5M64 [RIVA TNT2 Model 64/Model 64 Pro]"
	BusID       "PCI:1:0:0"
EndSection

Section "Device"
	Identifier  "device1"
	Driver      "trident"
	VendorName  "Trident Microsystems"
	BoardName   "TGUI 9660/938x/968x"
	BusID       "PCI:0:13:0"
EndSection

Section "Device"
	Identifier  "device2"
	Driver      "trident"
	VendorName  "Trident Microsystems"
	BoardName   "TGUI 9660/938x/968x"
	BusID       "PCI:0:19:0"
EndSection

Section "Device"
	Identifier  "device3"
	Driver      "s3virge"
	VendorName  "S3 Inc."
	BoardName   "ViRGE/DX or /GX"
	BusID       "PCI:0:14:0"
EndSection

Section "Monitor"
	Identifier   "monitor0"
	VendorName   "AOC"
	ModelName    "LM522"
	HorizSync    30.0 - 63.0
	VertRefresh  55.0 - 75.0
	Option      "DPMS"
EndSection

Section "Monitor"
	Identifier   "monitor1"
	VendorName   "AOC"
	ModelName    "LM522"
	HorizSync    30.0 - 63.0
	VertRefresh  55.0 - 75.0
	Option      "DPMS"
EndSection

Section "Monitor"
	Identifier   "monitor2"
	VendorName   "AOC"
	ModelName    "LM522"
	HorizSync    30.0 - 63.0
	VertRefresh  55.0 - 75.0
	Option      "DPMS"
EndSection

Section "Monitor"
	Identifier   "monitor3"
	VendorName   "AOC"
	ModelName    "LM522"
	HorizSync    30.0 - 63.0
	VertRefresh  55.0 - 75.0
	Option      "DPMS"
EndSection

Section "Screen"
	Identifier	"screen0"
	Device     	"device0"
	Monitor		"monitor0"
	DefaultDepth	16
	SubSection "Display"
		Depth	16
		Modes	"1024x768"
	EndSubSection
EndSection

Section "Screen"
	Identifier      "screen1"
	Device          "device1"
	Monitor         "monitor1"
	DefaultDepth    16
	SubSection "Display"
		Depth   16
		Modes   "1024x768"
	EndSubSection
EndSection

Section "Screen"
	Identifier      "screen2"
	Device          "device2"
	Monitor         "monitor2"
	DefaultDepth    16
	SubSection "Display"
		Depth   16
		Modes   "1024x768"
	EndSubSection
EndSection

Section "Screen"
	Identifier      "screen3"
	Device          "device3"
	Monitor         "monitor3"
	DefaultDepth    16
	SubSection "Display"
		Depth   16
		Modes   "1024x768"
	EndSubSection
EndSection

Section "InputDevice"
	Identifier	"mouse0"
	Driver		"mouse"
	Option          "CorePointer"
	Option          "Device"		"/dev/input/mice"
	Option          "Protocol"      	"ImPS/2"
	Option          "Emulate3Buttons"       "true"
EndSection

Section "InputDevice"
	Identifier      "keyboard0"
	Driver          "kbd"
	Option          "CoreKeyboard"
	Option          "XkbRules"      "xorg"
	Option          "XkbModel"      "abnt2"
	Option          "XkbLayout"     "br"
	Option          "XkbVariant"    "abnt2"
EndSection

Section "ServerFlags"
	Option "AllowMouseOpenFail"	"yes"
	Option    "DontVTSwitch" "yes"
	Option    "DontZap"       "yes"
	Option    "BlankTime"    "0"
	Option    "StandbyTime"  "0"
	Option    "SuspendTime"  "0"
	Option    "OffTime"      "0"
EndSection
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