[Mageia-dev] Problem with gdm metacity again

Thu Sep 8 22:50:55 CEST 2011

'Twas brillig, and Colin Guthrie at 08/09/11 11:59 did gyre and gimble:
+> '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?
+
+Actually, I believe from speaking with upstream that this is just a bug
+in gdm. THere should be a new release soon that fixes it.
+
+Col
+
+
+-- 
+
+Colin Guthrie
+mageia(at)colin.guthr.ie
+http://colin.guthr.ie/
+
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+