It's possible, though it's hard to confirm as I cannot find a kernel
OOPS message in that ticket.
If they can avoid hanging if the dock is plugged in when first booting,
then I think they are very likely related.
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Sorry for the delayed followup, but if your machine is booted with it
plugged in, are you then able to unplug and re-plug the device without
issue?
Or does the hang re-occur regardless of whether the device was plugged
in at boot or not?
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I don't think this issue is related to LP #1820811.
In #1820811, the hang always occurs when hot-plugging.
With this issue, if the device is cold plugged (plugged in at boot), it
can be disconencted and re-connected without issue.
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Issue still remains with the mainline kernel. The contents of the
kernel Oops message differs slightly, but still very similar:
[ 27.532858] BUG: unable to handle kernel NULL pointer dereference at
03e8
[ 27.532862] #PF error: [WRITE]
[ 27.532865] PGD 0 P4D 0
[ 27.532869]
Public bug reported:
When plugging in my Cable Matters USB-C Dual 4K DisplayPort Docking
Station into my system, after it has already booted, the system hangs
with a kernel OOPS. This is always repeatable.
Steps to reproduce:
1. Ensure docking station is unplugged or shut-off.
2. Boot up
I have verified this issue still exists in kernel version 4.18.0-10.
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https://bugs.launchpad.net/bugs/1819924
Title:
System hangs when hot-plugging dual monitor dock
We are trying to determine if this bug is related to bug #1819924.
With the affected kernel versions, does the hang still occur if the dock
is connected before booting?
That is, with your computer shut off, plug in the dock and then boot up.
Does the computer hang after booting?
If not, are you
I have the same issue with my Cable Matters USB-C dual 4k DisplayPort
docking station and HP Elitebook laptop.
In my experience, it does not occur on every disconnect, however each
time it does occur, it appears to be preceded by a kernel oops:
[114032.828215] usb 2-1: USB disconnect, device
It had actually been working fine in 20.04 until a recent kernel update
to 5.4.0-33.37.
Since the update, it always fails with this stack trace:
[140594.217061] [ cut here ]
[140594.217062] sysfs group 'power' not found for kobject 'i2c-11'
[140594.217079] WARNING: CPU: 5
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