Bug 241220

Created attachment 155347 [details]
gdm debug output from /var/log/messages

Created attachment 155348 [details]
/var/log/gdm/:20.log

curiously enough, gdmflexiserver (without the -n) works fine

I can't get gdmflexiserver working with xnest either, but a regular display
works (fastuserswitching).

Versions:
gdm-2.18.2-1.fc7
xorg-x11-server-Xnest-1.3.0.0-8.fc7
xorg-x11-server-Xephyr-1.3.0.0-7.fc7


$ gdmflexiserver -d --xnest
Sending command: 'VERSION'
  Got response: 'GDM 2.18.2'
Sending command: 'AUTH_LOCAL 917a886c9c02bf49d16dca8ac4d2fc16'
  Got response: 'OK'
Sending command: 'AUTH_LOCAL 917a886c9c02bf49d16dca8ac4d2fc16'
  Got response: 'OK'
Sending command: 'QUERY_VT'
  Got response: 'OK 7'
Sending command: 'AUTH_LOCAL 917a886c9c02bf49d16dca8ac4d2fc16'
  Got response: 'OK'
Sending command: 'CONSOLE_SERVERS'
  Got response: 'OK :0,jaf,7;:20,foobar,8'
Sending command: 'FLEXI_XNEST :0 500 917a886c9c02bf49d16dca8ac4d2fc16
/tmp/.gdm1WDBTT'
  Got response: 'ERROR 6 No server binary'
Sending command: 'CLOSE'


If I manually start Xnest and connect, it'll still work, though:
su - testuser
Xnest -geometry 800x600 -ac :2 &
fluxbox -display :2

My Xnest displays gray window of new session, but nothing more.
gdmXnest writes: "Unrecognized argument:  " and fails to run.
When I start Xnest by its command and later run fluxbox with proper -display 
parameter, it writes that X server rejects a connections(AUDIT). Even with -
audit 0

I tried sabayon, which runs xnest window. It hadn't any problem with logging in 
as some user. I duplicated commands of Xnest displayed in gnome-system-monitor, 
but even these ones failed to run.

It seems that /etc/gdm/custom.conf does not have a valid definition for
FLEXI_XNEST.  When running "gdmflexiserver -d -n" the final message indicates no
binary found.

Adding the line
Xnest=/usr/bin/Xnest -audit 0 -name Xnest
to the "[daemon]" section of /etc/gdm/custom.conf corrects this first issue.

After this the "gdmflexiserver -d -n" shows the Xnest closing immedately after
opening.   It seems that whatever X client is started on the Xnest fails
immediately after startup, closing the Xnest server and causing gdmflexiserver
to report ".Sending command: 'CLOSE'"

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with gdmflexiserver in gdm-2.24.0-12 it's at least now clear that it's not supposed to work, rather than doing it badly:

$ gdmflexiserver -d --xnest

** (gdmflexiserver:11098): WARNING **: Not yet implemented