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Description of problem:
I want to share a computer between two people: A and B.
runlevel is 3, both login on a console, start one's own 
X server ("startx -- :0" and "startx -- :1"), and take
turns using the computer, switching between their X servers
with Ctrl-Alt-F7 and Ctrl-Alt-F8.  Worked JUST FINE originally.

Unfortunately, starting somewhere at RH8, 
this stopped  working perfectly:
the first user to login gets all audio devices assigned to him
(as in "chown A.root /dev/audio...; chmod u+re,go-rwx !$")
so the second user B cannot listen to music and play movies.

I solved this problem by creating a group "sound", 
adding both A and B to "sound", and doing
$ chgrp soung /dev/audio...; chmod g+rw !$
this had to be done several times, after each boot and upgrade, 
but it was tolerable (though unfortunate!)

With FC2, this system was extended to X.
The second user to login can no longer start X!
The "FC2" banner appears, the cursor becomes "x", 
but no "small icons" ever appear 
(and the server can be killed with Ctrl-Alt-Backspace 
even though I set DonTZap in /etc/X11/XF86Config).
This happens even after the A stops his X server - 
B still cannot start his own X session.

Therefore, now FC2 is effectively single-user:
A and B cannot share the same computer each having his own X session.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.set runlevel to 3
2.A logs in on a console, types "startx"
3.B logs in on a console, types "startx -- :1"
    

Actual Results:  A gets a normal gnome desktop
B gets an "FC2" splash screen which just sits there forever
A can listen to music and play movies.
B cannot.
when a CD is put in, it is mounted by A, not by B, 
even if A is away and B is in front of the computer.

Expected Results:  
B should also get his normal gnome desktop, like in FC1.
B should also be able to listen to music and play movies.
when A is away and B is in front of the computer, 
CDs should be mounted by B, not by A.

Additional info:

Please do not consider this X-specific.
Yes, I will try running at runlevel 5 and start 2 gdms
(by editing the [servers] section in /etc/X11/gdm/gdm.conf).

Even if it works, this does not resolve the original 
problem which I worked around with the "sound" group.

This is why I set severity to "security": apparently, you
chose this model (making the "first user to login" the owner
of the sound devices) for security reasons (the alernative
being to make the devices world writable).
Please consider making them group-writable, for the group
of the human users who have physical access to this computer.

More information:
<http://article.gmane.org/gmane.linux.redhat.fedora.general:54997>
<http://article.gmane.org/gmane.linux.redhat.fedora.general:55008>
<http://article.gmane.org/gmane.linux.redhat.fedora.general:55073>