*** This bug is a duplicate of bug 1813663 ***
https://bugs.launchpad.net/bugs/1813663
Also happening on Lenovo ThinkPad T470. External screen won't get any
signal and laptop screen shows is black. No mouse. When I booted from
linux-image-4.15.0-43-generic, it worked normally
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https://bugs.launchpad.net/bugs/1813796
Title:
kernel bug null pointer dereference
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