I can reproduce this issue, too.
When plug in the dock(with HDMI 4k monitor), the screen freeze and
keyboard/touchpad won't work, but I still can ssh into the machine.
Un-plug the dock, everything works again.
BTW, I found gnome-shell runs in 100% while the issue happened, and un-
plug the dock t
> The only thing that worked was switching the monitors from DisplayPort
to HDMI on the dock.
That's consistent with the kernel error in comment #20 and consistent
with comment #12, since MST is a DisplayPort feature.
** Summary changed:
- Window manager freezes when plugging in USB-C dock with
I *did* see those messages when I was initially debugging the problem.
This is from dmesg in one of the logs I made:
```
[ 20.525519] amdgpu :07:00.0: [drm] *ERROR* mstb f21f0a30 port 1:
DPCD read on addr 0x4b0 for 1 bytes NAKed
[ 20.570355] amdgpu :07:00.0: [drm] *ERROR* mstb
Does the situation improve if you add this to /etc/environment?;
MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0
Does it at least replace the freeze with just one black screen?
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: mutter (Ubuntu)
Status: Incomplete
Is anyone else seeing kernel messages like this (from bug 1971536)?
kernel: i915 :00:02.0: [drm] *ERROR* mstb caa481c4 port 1:
DPCD read on addr 0x4b0 for 1 bytes NAKed
** Tags added: dock i915
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Hmm, maybe we still need to treat those errors as a separate bug. If you
look at a full system log like in comment #14 then you see the errors
occurring many times. But presumably the "freeze" here does not occur
many times. So they may not be the cause of the freeze.
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Same errors in my syslog. See full text of
https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1970495/comments/2
Relevant snippet:
```
Apr 26 18:57:17 dathon gnome-shell[1649]:
meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int)
number < g_list_length (manage
^^^
Surprising, that was declared fixed some time ago in bug 1722811 and bug
1717170. If the same errors don't appear in Brian's logs (still waiting for
them) then please open a new bug.
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I believe I have the same issue. Dell XPS 13 9360 laptop connected to a
Dell U3011 monitor using a CableMatters USB-C to Displayport adapter.
When I plug my laptop the GNOME shell is almost completely unresponsive.
I can use the active window but I cannot switch windows. The only
reproducible way I
Yes a hard power-off is fine so long as you've waited 10 seconds first
per comment #4.
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https://bugs.launchpad.net/bugs/1970495
Title:
Window manager freezes when plugging in USB-C dock
This is a DisplayPort-related issue. At the office, I was able able to
try out an HDMI-only dock. The problem did NOT occur, and everything
worked perfectly.
Back at home, I switched my personal dock from DisplayPort to HDMI by
changing out the cables and, thus, using the dock's HDMI ports instead
@Daniel
(1) It's not possible to do a soft reboot under the error mode because
the displays are frozen. Will a hard power-off get the job done?
(2) Using "Ubuntu on Xorg" changed the symptoms somewhat, but the
outcome is still the same: the secondary monitor never cycles up -- it
stays black. The
I will go ahead and do so though I do want to mention I had no issues
when using the live installer with hdmi and was able to use it perfectly
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Tit
Pradeep, if you are experiencing a similar bug with a different root
cause then commenting here may cause confusion. It's probably better if
you open a new bug of your own by running:
ubuntu-bug gnome-shell
so that we can see the unique circumstances of your machine.
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I would like to mention same issue here either with c-dock or direct
HDMI plugin.
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Title:
Window manager freezes when plugging in USB-C dock with
What is the model of the USB-C dock? Many/most of them use DisplayLink
technology and so require that special kernel driver be installed first:
https://www.synaptics.com/products/displaylink-graphics/downloads/ubuntu
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