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On 2015-06-22T16:02:39+00:00 Maciej Piechotka wrote:

gnome-shell periodically stops working - no response to most mouse
inputs (hot corner gives animation but not change into overlay). The
only indication of failure is message "Gjs-Message: JS LOG: pushModal:
invocation of begin_modal failed" on stdout. I could not find more
problems in journalctl.

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/0

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On 2015-06-22T19:58:22+00:00 Jasper St. Pierre wrote:

That means that some other application took an X11 grab. There's not
much I can tell you other than to find the application that did that and
figure out what's going on.

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/1

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On 2015-06-23T01:52:47+00:00 Craig l300lvl wrote:

this is a known bug when using the Overview on Startup or alternate Jump
to Overview extension. I was never wise enough to determine why or what
we are doing wrong to cause this, but alas it happens depending on how
you use the extension. Some talk can be found here, but we are both
clueless:

https://github.com/simonthechipmunk/jumptooverview/issues/1

i dont know if you have installed these or anything similair, but just
though id mention that some weird things can make it happen...

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/2

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On 2015-06-23T16:51:47+00:00 Maciej Piechotka wrote:

(In reply to Jasper St. Pierre from comment #1)
> That means that some other application took an X11 grab. There's not much I
> can tell you other than to find the application that did that and figure out
> what's going on.

Hmm.

 - During one repro the only other application running was firefox so the 
options are limited.
 - Restart of gnome-shell (from tty1 or if gnome-temrminal had focus at the 
time of bug) should not fix the problem as far as I understand as the offending 
application would still hold the lock - but it does here.

PS. I don't have any extensions installed.

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/3

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On 2015-06-23T17:07:42+00:00 Jasper St. Pierre wrote:

Unfortunately, debugging tools on X11 are severely limited -- there is
no application which can tell you who took the grab. Are you able to
reproduce it often?

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/4

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On 2015-06-25T02:53:34+00:00 Maciej Piechotka wrote:

(In reply to Jasper St. Pierre from comment #4)
> Unfortunately, debugging tools on X11 are severely limited -- there is no
> application which can tell you who took the grab. Are you able to reproduce
> it often?

I reproduced it multiple times over the weekend but not since then. It
might be due to usage patters on workdays/weekends (or amount of things
I do during workdays on my own computer).

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/5

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On 2015-08-10T23:58:17+00:00 Satellitgo wrote:

I see this in efi boot f23 Alpha RC-2 workstation x86_64 installed to HD
may be related to ff google callendar pop up event alerts..?
Total system freezes up  have to cold boot to recover.

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/6

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On 2016-08-24T13:07:58+00:00 Michael Catanzaro wrote:

(In reply to Jasper St. Pierre (not reading bugmail) from comment #1)
> That means that some other application took an X11 grab. There's not much I
> can tell you other than to find the application that did that and figure out
> what's going on.

This happens to me every few days. Today it happened with Epiphany,
GNOME Terminal, gedit, Boxes, and System Settings open.

Surely the shell should be robust to this; applications should not be
able to break the desktop....

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/7

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On 2016-08-24T17:35:34+00:00 Rstrode wrote:

it's a limitation of X that applications can break the desktop like
that.  Wayland fixes it.

Anyway, I think Daniel Stone added the ability to print grab clients a
while back.  digging a little, what you have to do is:

$ gsettings set org.gnome.desktop.input-sources xkb-options
"['grab:debug']"

then hit ctrl-alt-F11 and grab info will be sent to the journal.  You'll
still have to use xwininfo or xlsclients or something to match up the
client ids.

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/8

------------------------------------------------------------------------
On 2017-05-25T18:58:50+00:00 Maciej Piechotka wrote:

(In reply to Ray Strode [halfline] from comment #8)
> it's a limitation of X that applications can break the desktop like that. 
> Wayland fixes it.
> 
> Anyway, I think Daniel Stone added the ability to print grab clients a while
> back.  digging a little, what you have to do is:
> 
> $ gsettings set org.gnome.desktop.input-sources xkb-options "['grab:debug']"
> 
> then hit ctrl-alt-F11 and grab info will be sent to the journal.  You'll
> still have to use xwininfo or xlsclients or something to match up the client
> ids.

I cannot find anything like that in journal. Any hints on what I should
look for?

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/9

------------------------------------------------------------------------
On 2018-05-18T19:14:58+00:00 Rstrode wrote:

sorry just noticed your question a year later.

The message is something like

Printing all currently active device grabs:
Active grab 0xc00lbad (xi2) on device 'Virtual core pointer' (2)
End list of active device grabs

should be in the X log.

Reply at: https://bugs.launchpad.net/ubuntu/+source/gnome-
shell/+bug/1734095/comments/13


** Changed in: gnome-shell-legacy-bugs
       Status: Unknown => Confirmed

** Changed in: gnome-shell-legacy-bugs
   Importance: Unknown => High

** Bug watch added: github.com/simonthechipmunk/jumptooverview/issues #1
   https://github.com/simonthechipmunk/jumptooverview/issues/1

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1734095

Title:
  Software & Updates not showing authorization popup [gnome-shell[N]:
  pushModal: invocation of begin_modal failed]

Status in GNOME Shell:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to Ubuntu 17.10 (from 17.04), if I open the Software
  and Updates app and attempt to change anything it does not popup the
  authorization dialog and will not let changes through.  In sylog I see

  Nov 23 10:07:04 tigger gnome-shell[2142]: polkitAuthenticationAgent: Received 
3 identities that can be used for authentication. Only considering one.
  Nov 23 10:07:04 tigger gnome-shell[2142]: pushModal: invocation of 
begin_modal failed
  Nov 23 10:07:04 tigger gnome-shell[2142]: polkitAuthenticationAgent: Failed 
to show modal dialog. Dismissing authentication request for action-id 
com.ubuntu.softwareproperties.applychanges cookie 
1-28e9d285258e7cd70c2af2980886a55b-1-cff4894642cc4a6c033597370ee1f740
  Nov 23 10:07:04 tigger software-properties-gnome.desktop[3367]: 
ERROR:root:Authentication canceled, changes have not been saved

  Before the upgrade it was ok.
  Other apps that require authorisation function as expected.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.1-0ubuntu5
  ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
  Uname: Linux 4.13.0-17-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Nov 23 10:07:44 2017
  DisplayManager: lightdm
  InstallationDate: Installed on 2014-10-21 (1128 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20141017)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to artful on 2017-11-22 (0 days ago)

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