Switching desktops still fail in 9.04 amd 64, although in far less epic
manner.

Now the problem seems to appear only when I use 2 displays (Xinerama),
and the problem is a crash.

Note sure if that is identical bug or not?

in xsession errors:
Xlib:  extension "RANDR" missing on display ":20.0".
Xlib:  extension "XFree86-Misc" missing on display ":20.0".
Xlib:  extension "XFree86-Misc" missing on display ":20.0".

before crash, and on crash I got:

<unknown>: Fatal IO error 11 (Resource temporarily unavailable) on X server 
:20.0.
konsole(713) Konsole::SessionManager::~SessionManager: Konsole SessionManager 
destroyed with sessions still alive
x-session-manager: Fatal IO error 11 (Resource temporarily unavailable) on X 
server :20.0.
gnome-settings-daemon: Fatal IO error 11 (Resource temporarily unavailable) on 
X server :20.0.
Window manager warning: Fatal IO error 11 (Resource temporarily unavailable) on 
display ':20.0'.
nautilus: Fatal IO error 11 (Resource temporarily unavailable) on X server 
:20.0.

amd64 ubuntu 64bit, nvidia card 01:00.0 VGA compatible controller:
nVidia Corporation GeForce 8600 GT (rev a1)



cat /etc/X11/xorg.conf
# nvidia-settings: X configuration file generated by nvidia-settings            
                                                                                
                              
# nvidia-settings:  version 1.0  (bui...@crested)  Sun Feb  1 20:25:37 UTC 2009 
                                                                                
                              
                                                                                
                                                                                
                              
# xorg.conf (X.Org X Window System server configuration file)                   
                                                                                
                              
#                                                                               
                                                                                
                              
# This file was generated by dexconf, the Debian X Configuration tool, using    
                                                                                
                              
# values from the debconf database.                                             
                                                                                
                              
#                                                                               
                                                                                
                              
# Edit this file with caution, and see the xorg.conf manual page.               
                                                                                
                              
# (Type "man xorg.conf" at the shell prompt.)                                   
                                                                                
                              
#                                                                               
                                                                                
                              
# This file is automatically updated on xserver-xorg package upgrades *only*    
                                                                                
                              
# if it has not been modified since the last upgrade of the xserver-xorg        
                                                                                
                              
# package.                                                                      
                                                                                
                              
#                                                                               
                                                                                
                              
# Note that some configuration settings that could be done previously           
                                                                                
                              
# in this file, now are automatically configured by the server and settings     
                                                                                
                              
# here are ignored.                                                             
                                                                                
                              
#                                                                               
                                                                                
                              
# If you have edited this file but would like it to be automatically updated    
                                                                                
                              
# again, run the following command:                                             
                                                                                
                              
#   sudo dpkg-reconfigure -phigh xserver-xorg                                   
                                                                                
                              

Section "ServerLayout"
    Identifier     "Default Layout"
    Screen      0  "Screen0" 1680 0
    Screen      1  "Screen1" LeftOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"    
EndSection                                   

Section "Module"
    Load           "glx"
EndSection              

Section "ServerFlags"

# Removed Option "Xinerama" "0"
    Option         "Xinerama" "1"
EndSection                       

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"      
EndSection                    

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0" 
    Driver         "mouse"  
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"  
EndSection                               

Section "Monitor"
    Identifier     "Configured Monitor"
EndSection                             

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown" 
    ModelName      "Hitachi W240D DVI"
    HorizSync       30.0 - 83.0       
    VertRefresh     59.0 - 76.0       
EndSection                            

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown" 
    ModelName      "ACI VW225"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 76.0
EndSection                     

Section "Device"
    Identifier     "Configured Video Device"
    Driver         "nvidia"                 
    Option         "NoLogo" "True"          
EndSection                                  

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8600 GT"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8600 GT"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection

Section "Screen"
    Identifier     "Default Screen"
    Device         "Configured Video Device"
    Monitor        "Configured Monitor"
    DefaultDepth    24
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "DFP-0: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "DFP-1: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection



** Changed in: gdm (Ubuntu)
       Status: Invalid => New

-- 
epic or partiall fail of user switching: crash (nvidia) or works only each 2nd 
or 3rd time (intell gfx) 
https://bugs.launchpad.net/bugs/311978
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