Might be a Wayland bug after all:
jul 17 06:49:40 X1-carbon gnome-shell[3140]: XWAYLAND: mode -1x-1 is not
available
... is the recurring error message (between lots of "thunderbird[3569]:
Couldn't map window 0x7f4cbe67ab20 as subsurface because its parent is
not mapped." and other processes
This is a successful docking attempt.
I rebooted my laptop with the dock attached. At about 06:30:30, I decide
to remove the dock, in order to try to replicate the behaviour. At
06:30:37 I'm plugging it in again.
I have not redacted these logs, no obfuscation etc, so yeah, you can see
all the
Here are two full logs. One where things go wrong. I'm walking upstairs
at 06:15 and at 06:16:17, the first logs indicate that the dock is
connected ("usb 1-4: new high-speed USB device number 53 using
xhci_hcd"), the "Cypress Semiconductor USB Billboard" shows up 0.7
seconds later.
Please note
Given the Bug Description says the problem doesn't occur in the live
installer session, that suggests this is Wayland specific or even
specific to atomic KMS. So please try the workaround from comment #19.
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Sounds like the kernel error message is harmless:
https://lists.freedesktop.org/archives/dri-devel/2022-February/342776.html
So just correlated with other USB-C dock issues, not the cause of them.
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See also bug 2000173
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https://bugs.launchpad.net/bugs/1970495
Title:
Window manager freezes when plugging in USB-C dock with external
monitor ([drm] *ERROR* mstb
Experiencing similar issue frequently with Thinkpad T490 using Ubuntu 20.04 and
Thinkpad TB3 dock with two external displays connected via DisplayPort.
Occasionally have seen "UBSAN: shift-out-of-bounds" and "UBSAN: invalid-load"
errors in addition to "DPDC read NAKed" when connecting the dock,
My Thinkpad X1 gen 6 with Ubuntu 22.04, Lenovo 40AJ dock with 4K LG
monitor with DP cable, will sometimes just show 2 or 4 lines with "DPCD
read on addr 0x4b0 for 1 bytes NAKed", after which the system will just
continue to work. But sometimes the "1 bytes NAKed" messages just keep
running - which
Hi, same error occur to me. Dell XPS 17 9710. Ubuntu 22.04, Wayland.
```
[387809.776955] i915 :00:02.0: [drm] *ERROR* mstb 586103bb port 3:
DPCD read on addr 0x4b0 for 1 bytes NAKed
[387809.782229] i915 :00:02.0: [drm] *ERROR* mstb 586103bb port 1:
DPCD read on addr
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
> 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*
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:
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
^^^
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
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
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
@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.
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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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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https://bugs.launchpad.net/bugs/1970495
Title:
Window manager freezes when
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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