Random hangs with GDM3

[Saurav Sengupta]

I am using GNOME Shell and experience random hangs while using GDM (v3) as the display manager on Ubuntu. The technical specifications are given below:-

Ubuntu version: 12.10 amd64
linux version: 3.5.0-23.35 generic
gdm version: 3.6.1-0ubuntu1
gnome-shell version: 3.6.2-0ubuntu0.2
gnome-session version: 3.6.0-0ubuntu1.1
System: Toshiba Satellite laptop C850-P5010
Graphics: Intel Sandybridge Mobile (Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09), also called Intel Integrated HD Graphics)

I have installed all and only officially released updates for GDM, GNOME, X and the Linux kernel. The GDM Greeter log shows a "failed to create drawable" message. The hang either occurs randomly while starting the system or equally randomly if I log out and log in graphically several times in a row. I cannot duplicate the hang reliably. The system stops responding to all input and I need to force the power off to get out of the situation. I have also experienced the same problem on the Acer Aspire 5755. I have not installed/used the GDM3 Setup tool or changed any GDM parameters from the defaults.