[Mageia-dev] Problem with gdm metacity again

Thu Sep 8 12:59:00 CEST 2011

'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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