Bug#1137165: Additional information.

[J W]

I have worked out how I can boot to the v7 kernel.

I currently use a couple of conf files within /etc/X11/xorg.conf.d/ that
allow me to boot to either "just the amd" laptop screen or both the laptop
"amd" screen and the "nvidia" external desktop monitors (via HDMI & via a
USB dock with HDMI/Displayport). My current boot is for the amd only
version... so guessing nothing is being loaded as far as the nvidia is
concerned; hence it works where as previously some of the versions/boot
failed with diver errors (possibly due to the hdmi actually being plugged
in at boot and/or making the nvidia conf file active depending on if I'm at
my desk or on the couch!)

These are the conf (currently held) files. The current boot is completely
X11 default handling.

cat /etc/X11/xorg.conf.d/10-prime_nvidiagpu.conf.hold
Section "ServerLayout"
    Identifier  "layout"
    Screen 0    "nvidia"
    Inactive    "amdgpu"
EndSection

Section "Device"
    Identifier  "nvidia"
    Driver      "nvidia"
    BusID       "PCI:1:0:0" # Sample: "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier  "nvidia"
    Device      "nvidia"
    Option      "AllowEmptyInitialConfiguration"
    #  Option         "ForceFullCompositionPipeline" "on"
    #  Option         "AllowIndirectGLXProtocol" "off"
    #  Option         "TripleBuffer" "on"
EndSection

Section "Device"
    Identifier  "amdgpu"
    # Driver      "amdgpu"
    Driver      "modesetting"
    BusID       "PCI:6:0:0"  # Sample: "PCI:0:2:0"
EndSection

Section "Screen"
    Identifier "amdgpu"
    Device "amdgpu"
EndSection

cat /etc/X11/xorg.conf.d/10-prime_amdgpu.conf.hold
Section "ServerLayout"
    Identifier  "layout"
    Screen 0    "amdgpu"
    Inactive    "nvidia"
    Option      "AllowNVIDIAGPUScreens"
EndSection

Section "Device"
    Identifier  "nvidia"
    Driver      "nvidia"
    BusID       "PCI:1:0:0" # Sample: "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier  "nvidia"
    Device      "nvidia"
    Option      "AllowEmptyInitialConfiguration"
    #  Option         "ForceFullCompositionPipeline" "on"
    #  Option         "AllowIndirectGLXProtocol" "off"
    #  Option         "TripleBuffer" "on"
EndSection

Section "Device"
    Identifier  "amdgpu"
    Driver      "amdgpu"
    #   Driver      "modesetting"
    BusID       "PCI:6:0:0"  # Sample: "PCI:0:2:0"
EndSection

Section "Screen"
    Identifier "amdgpu"
    Device "amdgpu"
EndSection
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