The same bug can occur with app windows if the scale is high enough to
make them larger than the monitor. So DING really isn't to blame - it's
just a likely trigger given the size of the window.
** No longer affects: gnome-shell-extension-desktop-icons-ng (Ubuntu)
** Summary changed:
- Screen
I can reproduce the bug with a 1080p laptop + 1080p monitor now. The
trick is to configure the laptop screen with a different scaling factor
to whatever the external monitor will get by default. When the two
screens have the same resolution but different scales, windows will jump
between the
I also have hardware that exhibits the bug. That's why I started digging
into it this week. No guarantees I will have a solution any time soon,
so don't assume I've totally taken over. I just assigned it to myself
because Seb thought nobody was working on it when I already was.
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Oh, I see you're taking the bug.
I should receive an affected laptop in few days, so if you want I can
continue with this. As debugging via SSH wasn't the best thing.
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Tried with the newest mutter (42.2-0ubuntu1) and gnome-shell
(42.2-0ubuntu0.2), the screen freeze after I plug external monitor.
** Attachment added: "gnome-shell-20220621.log"
https://bugs.launchpad.net/oem-priority/+bug/1976204/+attachment/5598650/+files/gnome-shell-20220621.log
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More progress:
The cause is meta_window_wayland_update_main_monitor() constantly
changing which monitor the window (presumably DING because there aren't
any others) prefers. The toggle is happening on the last line of
meta_window_wayland_update_main_monitor() and if you remove that line
then the
There is a corresponding number of meta_workspace_add_window() calls,
also from set_workspace_state().
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https://bugs.launchpad.net/bugs/1976204
Title:
Screen freeze
Small progress trying to trace the root cause today:
I don't yet see gnome-shell doing anything wrong. It is reacting to an
infinite flood of workspace 'window-removed' signals. That signal can
only come from one function in mutter, and during the infinite flood I
see 'on_all_workspaces' is
mutter!2413 is in version 42.2 which I am using already, and the bug is
still present, confirming comment #14.
** Changed in: gnome-shell (Ubuntu)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** Changed in: mutter (Ubuntu)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
**
Daniel,
Thus, does the PPA from comment#14 can fix your case?
if it doesn't, then probably there are two issues or other patch(s) are needed.
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The bug doesn't happen if I build mutter/gnome-shell from git. The bug
still doesn't happen if I build the Ubuntu 42.1 tags (jammy) from salsa,
with all Ubuntu patches.
Using the jammy release binaries the bug still occurs consistently. I am
not getting any results from gjs_dumpstack anymore
Good news: I can reproduce the bug now using an HP Skylake laptop with
built-in 4K panel. Everything freezes if I add an external 4K display.
The freeze does NOT occur if I have DING disabled.
If I use both monitors without DING, then only enabling DING makes the
freeze happen again.
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All the 4k eDP laptops will have this issue, I tried on HP ZBook (which
includes nv card) and switch to wayland. Plug external 4k monitor can
reproduce too.
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I've just finished testing 2x4K on i7-9750H with jammy and it works
perfectly. All default settings with DING enabled. I tested both HDMI
and USB-C.
So something about this bug seems to be hardware-specific as you keep
mentioning. It would be really annoying if an OLED XPS was the minimum
** Summary changed:
- Screen freeze
+ Screen freeze if a 4K monitor is added to a 4K laptop while DING is active
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => High
** Changed in: mutter (Ubuntu)
Importance: Undecided => High
** Changed in:
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