[Mageia-dev] Problem with gdm metacity again

[Colin Guthrie]

'Twas brillig, and JA Magallon at 07/09/11 12:03 did gyre and gimble:
> 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.

It's almost certainly a permissions thing.

I'm not sure GDM registers itself with consolekit anymore. And
in-so-doing, will not get permissions on the DRI device and thus will
not be able to run the nice new shell.


If you run systemd then all should be well.

Col



-- 

Colin Guthrie
mageia(at)colin.guthr.ie
http://colin.guthr.ie/

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