Comment 110 for bug 1310489

Ubuntu 15.10 x86_64
GPU Manager removes or replaces xorg.conf depending on Nvidia Prime settings.
When set to integrated graphics, xorg.conf gets deleted as expected.
When set to discrete GPU, xorg.conf gets written with failsafe values.
 gpu-manager.log (integrated):

log_file: /var/log/gpu-manager.log
last_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
new_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
grep dmesg status 256
dmesg status 256 == 0? No
Is nvidia loaded? yes
Was nvidia unloaded? no
Is nvidia blacklisted? no
Is fglrx loaded? no
Was fglrx unloaded? no
Is fglrx blacklisted? no
Is intel loaded? yes
Is radeon loaded? no
Is radeon blacklisted? no
Is nouveau loaded? no
Is nouveau blacklisted? yes
Is fglrx kernel module available? no
Is nvidia kernel module available? yes
Vendor/Device Id: 8086:416
BusID "PCI:0@0:2:0"
Is boot vga? yes
Vendor/Device Id: 10de:139a
BusID "PCI:1@0:0:0"
Is boot vga? no
Skipping "/dev/dri/card1", driven by "nvidia-drm"
Skipping "/dev/dri/card0", driven by "i915"
Skipping "/dev/dri/card1", driven by "nvidia-drm"
Skipping "/dev/dri/card0", driven by "i915"
Skipping "/dev/dri/card1", driven by "nvidia-drm"
Found "/dev/dri/card0", driven by "i915"
output 0:
 eDP connector
Number of connected outputs for /dev/dri/card0: 1
Does it require offloading? yes
last cards number = 1
Has amd? no
Has intel? yes
Has nvidia? yes
How many cards? 2
The number of cards has changed!
Has the system changed? Yes
main_arch_path x86_64-linux-gnu, other_arch_path i386-linux-gnu
Current alternative: /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf
Current core alternative: (null)
Is nvidia enabled? no
Is fglrx enabled? no
Is mesa enabled? yes
Is pxpress enabled? no
Is prime enabled? no
Is nvidia available? yes
Is fglrx available? no
Is fglrx-core available? no
Is mesa available? yes
Is pxpress available? no
Is prime available? yes
System configuration has changed
Intel IGP detected
Intel hybrid system
Nvidia driver version 355.11 detected
/sys/class/dmi/id/product_version="1.0"
/sys/class/dmi/id/product_name="X550JX"
1st try: bbswitch without quirks
Loading bbswitch with "load_state=-1 unload_state=1" parameters
Selecting prime
/usr/bin/update-alternatives --set x86_64-linux-gnu_gl_conf /usr/lib/nvidia-355-prime/ld.so.conf
update-alternatives status 0
Calling ldconfig
ldconfig status 0
/usr/bin/update-alternatives --set i386-linux-gnu_gl_conf /usr/lib/nvidia-355-prime/alt_ld.so.conf
update-alternatives status 0
Calling ldconfig
ldconfig status 0
Removing xorg.conf. Path: /etc/X11/xorg.conf
Moved /etc/X11/xorg.conf to /etc/X11/xorg.conf.12132015
Powering off the discrete card
Unloading nvidia-uvm with "no" parameters
Unloading nvidia with "no" parameters