bbswitch fails to disable Discrete (Nvidia) Graphics

[Mike Thompson]

# If this bug report can be imprved in any way or more information could be added for clarification, please don't hesitate to ask.
# I would also note, that while my explanation of the behavior might be as expected, the DMESG output still seems to indicate a bug, so please do read the whole bug. I am happy to rewrite it to represent the issue better if needs be.

Behavior: When an external display is pluged into the mini-display port of the computer, and bbswitch is sent the off signal (sudo tee /proc/acpi/bbswitch <<<OFF) the monitor contues to display

Expected Bahavior: That no signal would be sent to the external monitor.

DMESG Output on off:
[420803.212355] pci 0000:02:00.0: power state changed by ACPI to D0
[420847.824655] bbswitch: disabling discrete graphics
[420847.824684] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20130517/nsarguments-95)
[420848.340554] pci 0000:02:00.0: power state changed by ACPI to D3cold

Steps to reproduction:
1) Boot computer
2) Set the state of of bbswitch to OFF (sudo tee /proc/acpi/bbswitch <<<OFF)
3) Check the state of bbswitch (sudo cat /proc/acpi/bbswitch)
  >> 0000:02:00.0 OFF
4) Verify a state of "OFF"
5) Plug an external monitor in to the Mini display port
6) Check the state of bbswitch (sudo cat /proc/acpi/bbswitch)
  >> 0000:02:00.0 OFF
7) Verify a state of "OFF"
8) Verify that the monitor can be enabled via the "Display" dialog of XFCE4 (ofce4-display-settings)
9) Check the state of bbswitch (sudo cat /proc/acpi/bbswitch)
  >> 0000:02:00.0 OFF
10) Verify a state of "OFF"

For the record I have attempted other vairous ON/OFF OFF/ON ordered scenearios in my repro attempts. The long and short of all of this is that I believe the Nvidia card is never disabled

Turning bbswitch off, on,and off with verbose output:
1) Boot computer
2) Set the state of of bbswitch to OFF
   sudo tee /proc/acpi/bbswitch <<<OFF
   >>OFF
3) Check the state of bbswitch
   sudo cat /proc/acpi/bbswitch
   >> 0000:02:00.0 OFF
4) Check DMESG
   dmesg | grep -C 10 bbswitch
   # Output is verbose, see "bbswitch_off_dmesg_out" in attached archive
5) Set the state of of bbswitch to ON
   sudo tee /proc/acpi/bbswitch <<<ON
   >>ON
6) Check the state of bbswitch
   sudo cat /proc/acpi/bbswitch
   >> 0000:02:00.0 ON
7) Check DMESG
   dmesg | grep -C 10 bbswitch
   # Output is verbose, see "bbswitch_off_dmesg_on" in attached archive
8) Set the state of of bbswitch to OFF
   sudo tee /proc/acpi/bbswitch <<<OFF
   >>OFF
9) Check the state of bbswitch
   sudo cat /proc/acpi/bbswitch
   >> 0000:02:00.0 OFF
10) Check DMESG
   dmesg | grep -C 10 bbswitch
   # Output is verbose, see "bbswitch_off_dmesg_out_again" in attached archive

System Information:

Hardware:
I am attempting to use bumblebee on a Dell M3800 laptop (Dec 2013) Running Debian Testing.
Chipset: Mobile Intel® HM87 Express
Video Card: NVIDIA® Quadro® K1100M with 2GB GDDR5 dedicated memory

Operating System Information:
3.11-2-amd64 #1 SMP Debian 3.11.10-1 (2013-12-04) x86_64 GNU/Linux

Xorg Version:
mike@mike-m3800:~/workspace$ Xorg -version

X.Org X Server 1.14.5
Release Date: 2013-12-12
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.13.0-rc2-patser+ x86_64 Debian
Current Operating System: Linux mike-m3800 3.11-2-amd64 #1 SMP Debian 3.11.10-1 (2013-12-04) x86_64
Kernel command line: BOOT_IMAGE=/vmlinuz-3.11-2-amd64 root=/dev/mapper/mike--m3800-root ro quiet
Build Date: 13 December 2013 10:12:53AM
xorg-server 2:1.14.5-1 (Maarten Lankhorst <email address hidden>)
Current version of pixman: 0.32.4
 Before reporting problems, check http://wiki.x.org
 to make sure that you have the latest version.

Window Manager XFCE4 version 4.10