[Mageia-dev] Problem with gdm metacity again

[Colin Guthrie]

'Twas brillig, and JA Magallon at 07/09/11 18:18 did gyre and gimble:
> On Wed, 07 Sep 2011 13:27:05 +0100
> Colin Guthrie <mageia at colin.guthr.ie> wrote:
> 
>> '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.
>>
> 
> Yup, thats the problem.
> Booting into systemd gives this:
> 
> one:~# ll /dev/dri*
> total 0
> crw-rw----+ 1 root video 226,  0 2011.09.07 15:12 card0
> crw-rw-rw-  1 root video 226, 64 2011.09.07 15:12 controlD64
> one:~# getfacl /dev/dri/card0
> getfacl: Removing leading '/' from absolute path names
> # file: dev/dri/card0
> # owner: root
> # group: video
> user::rw-
> user:gdm:rw-
> group::rw-
> mask::rw-
> other::---
> 

OK, can you try this:

Can you edit and add the line: /etc/pam.d/gdm-welcome

-session    optional     pam_ck_connector.so

BEFORE the line:

session    include     system-auth

And then reboot... see if that helps?

Col

-- 

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

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