Gnome coming blank

Desktop
,
1

Hi All,

We are trying to start xserver as user using startx command, once startx start the X server we try to start the gnome-session on same display. But when we connect to the display using x11vnc it shows up all blank.

But with the same process if we start other desktop manager like: Mate, KDE those come up fine.

Setup details:

OS: centos 7.9
GPU: Quadro 4000
Gnome version: gnome-desktop3-3.28.2-2.el7.x86_64

Below are the steps to reproduce the issue:

1) Update /etc/pam.d/xserver to give permission to user to start X server.
	1.1) comment line “auth       required	pam_console.so”
	1.2) add line “auth required pam_permit.so”
2) Switch to non-root user.
3) run command “startx” in background.
4) From process find out the display id on which X server is started. ex: ps aux | grep “bin/X” | grep <userid>
5) export DISPLAY=<DISPLAY_ID>
6) run “gnome-session” command in background.
7) run “x11vnc” and connect through vnc client. For me Desktop is coming as blank.

But in step 6 if we try MATE or KDE, desktop comes up.

Any idea why it is happening?

2

Some snippet of gnome-session debug logs:

gnome-session-binary[45081]: DEBUG(+):
gnome-session-binary[45081]: DEBUG(+): Could not make systemd aware of QT_IM_MODULE=ibus environment variable: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
gnome-session-binary[45081]: DEBUG(+): Could not make systemd aware of XMODIFIERS=@im=ibus environment variable: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
gnome-session-binary[45081]: DEBUG(+): Could not make systemd aware of GNOME_DESKTOP_SESSION_ID=this-is-deprecated environment variable: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
gnome-session-binary[45081]: DEBUG(+): Could not make systemd aware of XDG_MENU_PREFIX=gnome- environment variable: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
gnome-session-binary[45081]: WARNING: Could not get session id for session. Check that logind is properly installed and pam_systemd is getting used at login.
gnome-session-binary[45081]: DEBUG(+): Using systemd for session tracking
gnome-session-binary[45081]: DEBUG(+): GsmManager: setting client store 0x8c0310
generating cookie with syscall
generating cookie with syscall
generating cookie with syscall
generating cookie with syscall
gnome-session-binary[45081]: DEBUG(+): Could not make systemd aware of SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/45081,unix/unix:/tmp/.ICE-unix/45081 environment variable: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
gnome-session-binary[45081]: DEBUG(+): GsmXsmpServer: SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/45081,unix/unix:/tmp/.ICE-unix/45081

gnome-session-binary[45081]: DEBUG(+): Could not make systemd aware of GNOME_KEYRING_CONTROL=/users/rangesg/.cache/keyring-28YFK1 environment variable: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
gnome-session-binary[45081]: DEBUG(+): Could not make systemd aware of SSH_AUTH_SOCK=/users/rangesg/.cache/keyring-28YFK1/ssh environment variable: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1

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