I was able to get LightDM (or GDM) with hybrid graphics only by manually
specifying an /etc/X11/xorg.conf file like follows (I generated it with
nvidia-xconfig and then made manual modifications following this [1]):
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 440.64
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 1650 with Max-Q Design"
BusID "PCI:1:0:0"
EndSection
Section "Device"
Identifier "Device1"
Driver "intel"
VendorName "Intel"
BusID "PCI:0@0:2:0"
Option "AccelMethod" "SNA"
EndSection
Section "Screen"
Identifier "Screen1"
Device "Device1"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "AllowEmptyInitialConfiguration" "True"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Are you using a similar configuration for X or it just works for you out
of the box?
About the BIOS, I checked and "Set Optimized" was Disable for me,
turning it to Enable seems to make me able to reboot with a Thunderbolt
adapter connected to the port.
Many thanks for your help!
[1] https://gist.github.com/alexlee-gk/76a409f62a53883971a18a11af93241b
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https://bugs.launchpad.net/bugs/1876741
Title:
Lenovo X1 boot crash with HDMI cable attached and laptop lid closed
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