*** This bug is a duplicate of bug 1813663 ***
https://bugs.launchpad.net/bugs/1813663
** This bug has been marked a duplicate of bug 1813663
External monitors does not work anymore 4.15.0-44
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I also switched to the 4.18.0-14-generic kernel, and it seems to just
work.
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https://bugs.launchpad.net/bugs/1813902
Title:
Lenovo Thinkpad T540p - Kernel Crash 4.15.0-44 (18.04 LTS)
I just installed the 4.15.0.45.47 kernel from the -proposed repo and it
seems to work like a charm :D
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https://bugs.launchpad.net/bugs/1813902
Title:
Lenovo Thinkpad T540p - Kernel
There is a newer linux kernel in -proposed pocket released today with
version 4.15.0-45.48, should have fixed your problem, please give it a
try.
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I'm having the same issue on a Dell Latitude 5289 laptop connected to a
dell USB-C dock with 2 external monitors, and USB keyboard and mouse
(Razer Naga Chroma).
My computer will immediately lock up upon pressing Super + L to lock the
screen when it's connected to the dock. When disconnected from
The problem went away with linux-image-generic-hwe-18.04 4.18.0.14.64. I
think I'll just switch to that kernel for machines maintained by me.
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The same thing happens on dock disconnect with Lenovo Thinkpad T480.
Here is the log.
Jan 30 17:42:46 cubbli18-gold kernel: [ 169.224084] BUG: unable to handle
kernel NULL pointer dereference at 0245
Jan 30 17:42:46 cubbli18-gold kernel: [ 169.224110] IP:
I can confirm this with Lenovo X280, except that it happens on a USB-C
connected monitor which has a builtin USB-hub (the monitor is the
docking station). It makes the docking station unusable. In older
kernels this setup used to work. I have multiple crashes like this.
Jan 29 18:01:00
I see a problem that I think may be the same on a T470s. I don't know
how to confirm if it's the same problem since my laptop crash when I
lock the screen when the laptop is docked in a Lenovo dock. It started
recently after upgrading the kernel.
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1813902
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