[Mageia-dev] Problem with gdm metacity again

[JA Magallon]

On Wed, 7 Sep 2011 13:01:39 +0300
Shlomi Fish <shlomif at shlomifish.org> wrote:

> Hi J. A.,
> 
> On Wed, 7 Sep 2011 11:42:33 +0200
> JA Magallon <jamagallon at ono.com> wrote:
> 
> > On Wed, 7 Sep 2011 11:15:21 +0200
> > JA Magallon <jamagallon at ono.com> wrote:
> > 
> > > Hi...
> > > 
> > > This old problem has surfaced again:
> > > 
> > > .xsession-errors:
> > > 
> > > ...
> > > Window manager warning: Screen 0 on display ":0" already has a window manager; try using the --replace option to replace the current window manager.
> > > Window manager warning: Screen 0 on display ":0" already has a window manager; try using the --replace option to replace the current window manager.
> > > ...
> > > 
> > > I get only the nautilus desktop, with two black bars on top and bottom of the screen.
> > > If I launch a terminal, 'gnome-shell --replace' works fine.
> > > 
> 
> I reported this bug here:
> 
> https://bugs.mageia.org/show_bug.cgi?id=2628
> 
> I can reproduce it here on my x86-64 Mageia Linux Cauldron laptop.
> 
> Regards,
> 
> 	Shlomi Fish
> 
> > > Any idea ?
> > > Can it be some personal setting ?
> > > 
> > > TIA
> > 
> > Digging a bit more, something is wrong detecting acceleration.
> > In GDM log:
> > 
> > gnome-session[4752]: DEBUG(+): fill: *** Looking if /usr/share/gnome-session/sessions/gdm-shell.session is a valid session file
> > gnome-session[4752]: DEBUG(+): fill: *** Launching helper 'bash -c "gnome-shell --help | grep -q gdm-mode && /usr/lib64/gnome-session-check-accelerated"' to know if session is runnable
> > gnome-session-is-accelerated: No hardware 3D support.
> > gnome-session-check-accelerated: Helper exited with code 256
> > gnome-session[4752]: WARNING: Session 'gdm-shell' runnable check failed: Exited with code 1
> > gnome-session[4752]: DEBUG(+): fill: *** Session is not runnable
> > gnome-session[4752]: DEBUG(+): fill: *** Getting session 'gdm-fallback'
> > 
> > This is for GDM's own session.
> > The same happens for user.
> > 
> > Any ideas ? How can I check why this fails ?
> > Its a netbook with Intel graphics, so it uses Mesa.
> > 
> > Will check on an nvidia system too.
> > 

I did, and everything works fine. I even discovered that GDM looks different
when acceleration is available ;)).

So these are two separate problems:

- Acceleration detection on some systems, from my limited tests, it works on
  nVidia (32bit, will check 64 shortly), and fails on intel (mesa???) graphics.
  This can be a bug report for gnome-session (/usr/lib64/gnome-session-check-accelerated*)
  or for Mesa if it's it what breaks things.

- In full mode, gnome-shell from the user replaces gnome-shell from gdm.
  But in fallback mode, gnome-shell can't replace GDM's metacity.

> > TIA
> 
> 
>