Comment 572 for bug 752542

Here are relevant tidbits

$ dmesg | grep -C10 bbswitch
[258535.153494] bbswitch: enabling discrete graphics
[258535.153508] pci 0000:01:00.0: power state changed by ACPI to D0
[258535.163812] pci 0000:01:00.0: Refused to change power state, currently in D3
[258540.368010] bbswitch: enabling discrete graphics
[258540.368022] pci 0000:01:00.0: power state changed by ACPI to D0
[258540.378160] pci 0000:01:00.0: Refused to change power state, currently in D3

$ uname -a
Linux pahoran 3.6.11-gentoo #2 SMP Tue Jan 22 14:59:36 MST 2013 x86_64 Intel(R) Core(TM) i7-3610QM CPU @ 2.30GHz GenuineIntel GNU/Linux

$ optirun -vv glxgears
[DEBUG]Reading file: /etc/bumblebee/bumblebee.conf
[INFO]Configured driver: nvidia
[DEBUG]Skipping auto-detection, using configured driver 'nvidia'
[DEBUG]Process /sbin/modinfo started, PID 32137.
[DEBUG]Hiding stderr for execution of /sbin/modinfo
[DEBUG]SIGCHILD received, but wait failed with No child processes
[DEBUG]Active configuration:
[DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
[DEBUG] X display: :8
[DEBUG] LD_LIBRARY_PATH: /usr/lib64/opengl/nvidia/lib:/usr/lib32/opengl/nvidia/lib:/usr/lib/opengl/nvidia/lib
[DEBUG] Socket path: /var/run/bumblebee.socket
[DEBUG] VGL Compression: proxy
[DEBUG]optirun version 3.0 starting...
[INFO]Response: No - error: Could not enable discrete graphics card

[ERROR]Cannot access secondary GPU - error: Could not enable discrete graphics card

[DEBUG]Socket closed.
[ERROR]Aborting because fallback start is disabled.
[DEBUG]Killing all remaining processes.