Bug#848790: Some more info added

[Javier Polo Cózar]

Just for helping to fix this bug I have saved journalctl output when I try to log in with gnome and I am "ejected" from gnome session.
The error seems to start here:

dic 22 22:59:00 sioux gnome-shell[1306]: The program 'gnome-shell' received an X Window System error.
                                         This probably reflects a bug in the program.
                                         The error was 'BadMatch (invalid parameter attributes)'.
                                           (Details: serial 1020 error_code 8 request_code 134 (SYNC) minor_code 16)
                                           (Note to programmers: normally, X errors are reported asynchronously;
                                            that is, you will receive the error a while after causing it.
                                            To debug your program, run it with the GDK_SYNCHRONIZE environment
                                            variable to change this behavior. You can then get a meaningful
                                            backtrace from your debugger if you break on the gdk_x_error() function.)
...
Hope it helps !
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