regression: blender won't start on optimus systems without nvidia enabled

[Jamin W. Collins]

With v2.62-1 from precise, I was able to start blender with or without the nvidia chipset enabled. However, with quantal and blender 2.63a-1ubuntu1 I have to enable the nvidia chipset or the application will not start. The problem persists even when the nvidia chipset is completely disabled (not seen by the system at all).

System: Lenovo Thinkpad W530

Mode - Optimus

$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GK107 [Quadro K2000M] (rev ff)

* w/ Nvidia OFF
$ blender
connect failed: No such file or directory
Xlib: extension "NV-GLX" missing on display ":0.0".
X Error of failed request: BadAlloc (insufficient resources for operation)
  Major opcode of failed request: 154 (GLX)
  Minor opcode of failed request: 3 (X_GLXCreateContext)
  Serial number of failed request: 139
  Current serial number in output stream: 140

* w/ Nvidia ON
$ optirun blender
# runs fine

Mode - Integrated Graphics

$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

$ blender
connect failed: No such file or directory
Xlib: extension "NV-GLX" missing on display ":0.0".
X Error of failed request: BadAlloc (insufficient resources for operation)
  Major opcode of failed request: 154 (GLX)
  Minor opcode of failed request: 3 (X_GLXCreateContext)
  Serial number of failed request: 139
  Current serial number in output stream: 140

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: blender 2.63a-1ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
Date: Fri Oct 19 21:01:12 2012
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: blender
UpgradeStatus: Upgraded to quantal on 2012-10-12 (7 days ago)