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[tanoloco <write@xxxxxxxxxx>]

Hello guys!

Same problem here with a fresh installation of Lucid Lynx 10.04 final release:
Motherboard -> Intel D850GB (Garibaldi)
cpu                -> Intel Pentium 4 - 2.0 GHz
graphic card  -> ATI Radeon 9250 128 MB DDR

problem:
1. logged in as admin user
2. try to switch to any user (admin or not with encrypted home or not) by pressing "switch user" under the menu of the right icon of the top panel next to the logged user-name
3. get a blank screen with no pointer. alt+f7 no effect, ctrl+alt+f7 no effect, ctrl+alt+f1/f2 etc sometimes got a console mode sometimes not.

*******************************************************************

I found a work-around (don't know if this is the right place to post it):
case A: you don't care about desktop effects
1. turn-off your desktop effects
2. reboot
3. it might be solved 
4. if not type on a terminal:
$ sudo chmod +w /boot/grub/grub.cfg
$ gksudo gedit /boot/grub/grub.cfg
find a line in your desired menuentry like:
linux	/boot/vmlinuz-2.6.32-21-generic root=UUID=95595d29-44d9-4b57-9b02-cbb5c5f127aa ro   quiet splash
and add nomodeset at the end to obtain something like
linux	/boot/vmlinuz-2.6.32-21-generic root=UUID=95595d29-44d9-4b57-9b02-cbb5c5f127aa ro   quiet splash nomodeset
$ sudo chmod -w /boot/grub/grub.cfg
5. reboot
6. it might be solved
7. if not I don't know :)

case B: you do care about desktop effects
This is more complex:
1. from a terminal install ati-drivers 
$ sudo apt-get install xorg-driver-fglrx
2. reboot
3. completely remove using synaptic any package with fglrx.
In my case:
fglrx
fglrx-kernel-source
xorg-driver-fglrx
fglrx-amdcccle
fglrx-modaliases
(I know that I've installed xorg-driver-fglrx just now but I need some dependencies it install with the above command but I cnnot understand which ones .. so I first install it with all the dependencies and then I remove it .. ok?)
4. reinstall:
libgl1-mesa-glx
libgl1-mesa-dri
xserver-xorg-video-ati
5. reboot
6. it might be solved
7. if not (as in my case) type in a terminal:
$ gksudo /etc/X11/xorg.conf
and  write inside the (blank) document:
Section "Device"
        Identifier      "Configured Video Device"
        Driver          "ati"
        BusID           "PCI:1:0:0"
        Option          "XAANoOffscreenPixmaps"
        Option          "AGPMode"       "8"
        Option          "AccelMethod"   "EXA"
        Option          "ColorTiling"   "on"
EndSection
save and close.
8. turn-on your desktop effects and try to switch user and it might be ok.

Sometimes when closing the session I get a prompt asking me to enter the
password rather then getting the gdm gui .. on this prompt I cannot
click on the bottom buttons (something as "change user" "leave a
message" and so on ) but I can still reach them by using the alt button.

Hoping that can help!

I sent an old post here
http://ubuntuforums.org/showthread.php?t=1368746

-- 
black screen when switching between multiple X session
https://bugs.launchpad.net/bugs/529882
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