Re: [gdm-list] double login

[Brian Cameron <Brian Cameron Sun COM>]

The GDM crash seems to happen after this kernel error message:

 Oct 20 09:54:30 ubu-desktop kernel: [  403.527767] gdm[4624] general 
protection ip:7f445cfbec40 sp:7fff6974c088 error:0 in 
libc-2.9.so[7f445cf3e000+168000]

Searching on Google for:

   gdm "general protection ip" sp error

I see a number of people on various distros complaining about similar
problems.  Most of them seem to be related to problems with drivers.
For example:

http://bbs.archlinux.org/viewtopic.php?id=50070
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-180/+bug/421442

If this is your problem, then you may need to contact your distro and
make sure that you have the latest drivers installed.  If your distro
has a bug tracking tool, I'd file a bug with them.

Or, perhaps, you might consider getting a different graphics card if the
one you are using is not well supported.

Some people seem to complain that this sort of error message is found
when using compiz.  You might try turning off compiz and see if that
helps.

Brian



> On Monday 19 October 2009 22:22:20 you wrote:
> > Guy:
> >
> > Glad to hear that you found some solution.  When
> > AlwaysLoginCurrentSession is true, this causes GDM to reconnect to any
> > running VT session.  So if you have a session running on VT7 and you try
> > to log into the same user on VT9, it will just switch you back to VT7.
> > The "double login" warning is a VT-specific feature, so it is expected
> > that you wouldn't see the warning when users try to login twice in
> > non-VT environments (such as multiseat or terminal server environments).
> >
> > Note that VT switching is only useful on the console display and is,
> > therefore, generally not supported in multiseat environments.  If the
> > version of GDM you are using is not smart enough to realize that
> > non-console displays do not support VT, then it makes sense to disable
> > VT.  Setting VTallocation to false basically turns off VT support
> > entirely in GDM.
> >
> > You are using GDM 2.18?  If you want to continue using the "old GDM",
> > then you might considering updating to the latest 2.20.10 version.  A
> > lot of bugs have been fixed in 2.20.10, so you might find it works
> > better.
> >
> > Brian
> >
> > > Have found some soulution:
> > > in gdm.conf set vtallocation=false and alwayslogincurrentsession=true(do
> > > not think this is needed)
> > > After that, it's impossible to login the same user:
> > > if you try to login the same user ,after filling in username and
> > > password,you get to see the username box again.So that is ok.(But there
> > > is no double login warning,  when this is set to true in gdm.conf)
> > > But  I can only make these eco-friendly multiseat computers(up to twelve
> > > users on one box) with gdm 2.18.And it is very hard to downgrade gdm in
> > > the new 9.10.
> > >
> > > guy
> > > guy
> > > _______________________________________________
> > > gdm-list mailing list
> > > gdm-list gnome org
> > > http://mail.gnome.org/mailman/listinfo/gdm-list
> Ok thanks,but I am not able to use gdm 2.20.And I do not know what's the 
> problem.
> here is the gdm debug in syslog:
> http://www.multiseatcomputer.be/syslog
> It's a ubuntu 9.04 machine with two screens as multiseat
> guy
>
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