Global application menu does not follow mouse move for displaying submenus in multi-monitor setups

Can't reproduce this... Is this always happening?

Do you get this also when using LIM mode [1]?

[1] gsettings set com.canonical.Unity integrated-menus true

No, the behavior stays the same after setting integrated-menus to true.

And to answer the question: Yes, it is always happening with all applications.

Did another tests with LIM mode activated using keepassx as test case: It works correctly when menu is displayed in the window title and the window is not maximized. When the window is maximized, the menu is displayed in the unity bar and it doesn't work.

What's the output for
  xinput

And if you run

  xinput test-xi2 --root

And you move the mouse around, do you see events happening?

xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech USB Laser Mouse id=9 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
    ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
    ↳ Power Button id=6 [slave keyboard (3)]
    ↳ Video Bus id=7 [slave keyboard (3)]
    ↳ Power Button id=8 [slave keyboard (3)]
    ↳ USB Keyboard id=10 [slave keyboard (3)]
    ↳ USB Keyboard id=11 [slave keyboard (3)]

$ xinput test-xi2 --root
[...]
EVENT type 6 (Motion)
    device: 9 (9)
    detail: 0
    flags:
    root: 3397.79/1078.45
    event: 3397.79/1078.45
    buttons:
    modifiers: locked 0 latched 0 base 0 effective: 0
    group: locked 0 latched 0 base 0 effective: 0
    valuators:
        0: 3394.79
        1: 1077.45
    windows: root 0xe5 event 0xe5 child 0x1063bce
EVENT type 13 (RawKeyPress)
    device: 3 (10)
    detail: 37
    valuators:

Yes, I see a lot of events happening when moving the mouse. Only the global application menu doesn't seem to react to these mouse events when after a menu was opened.

mhmh, can you try to do this:

Launch this command

$ sleep 5 && xinput test-xi2 --root

Then right-click in the terminal (to open a menu, or just open an unity menu) within 5 seconds... Then the xinput test-x2 should run, so at this point do you still see motion events as before?

Yes, I still see these motion events when moving the mouse afterwards:

$ sleep 5 && xinput test-xi2 --root
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech USB Laser Mouse id=9 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
    ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
    ↳ Power Button id=6 [slave keyboard (3)]
    ↳ Video Bus id=7 [slave keyboard (3)]
    ↳ Power Button id=8 [slave keyboard (3)]
    ↳ USB Keyboard id=10 [slave keyboard (3)]
    ↳ USB Keyboard id=11 [slave keyboard (3)]
EVENT type 17 (RawMotion)
    device: 2 (9)
    detail: 0
    flags:
    valuators:
          1: 1.00 (1.00)

EVENT type 6 (Motion)
    device: 9 (9)
    detail: 0
    flags:
    root: 3251.33/317.00
    event: 3251.33/317.00
    buttons:
    modifiers: locked 0 latched 0 base 0 effective: 0
    group: locked 0 latched 0 base 0 effective: 0
    valuators:
        1: 318.00
    windows: root 0xe5 event 0xe5 child 0x1000197

Attached a small video that demonstrates the behavior. I have to left-click to show the sub-menu below the cursor.

Mhmhmh... So plase ping me in IRC (Trevinho @ freenode) when you can as I think I need some more debug info, and maybe some vnc access. But anyway, ping me and we'll see.

Thanks to a debug session with Treviño. We narrowed the bug down:

The misbehavior is related to the multi-monitor setup. The mouse moves over the global menu are correctly honored on the left-most monitor. On all other monitors, the mouse moves are not honored (the right monitor in a dual-monitor setup, the middle and the right monitor in a triple-monitor setup).

Ubuntu 17.04 (zesty) is affected as well.

This bug was fixed in the package unity - 7.5.0+17.10.20170425.1-0ubuntu1

---------------
unity (7.5.0+17.10.20170425.1-0ubuntu1) artful; urgency=medium

  [ Dimitri John Ledkov ]
  * Drop libupstart-dev dependency, and simply include verbantim dbus
    object paths.
  * Do not use upstart-dbus.h in compiz_config_profile_setter either.

  [ Eleni Maria Stea ]
  * removes lowgfx option from ccsm, reads the "lowgfx" gsetting
    (lp:~hikiko/unity-control-center/unity-control-center.lowgfx) (LP:
    #1668950)

  [ Marco Trevisan (Treviño) ]
  * Panel: ensure the menu-manager tracker is updated to match monitor
    (LP: #1671432)
  * compiz-profile-setter: tool to update the current profile and use in
    systemd and Unity settings (LP: #1668950)

  [ Nick Dedekind ]
  * Fixed tooltip scaling issues. (LP: #1673950)

 -- Marco Trevisan (Treviño) <mail@3v1n0.net> Tue, 25 Apr 2017 17:59:20 +0000

Hello Benjamin, or anyone else affected,

Accepted unity into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/unity/7.4.5+16.04.20171116 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Hello Benjamin, or anyone else affected,

Accepted unity into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/unity/7.4.5+16.04.20171201.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

I already upgraded to Ubuntu 17.10 (artful)

Benjamin, so is this fixed for you in artful?

This bug was fixed in the package unity - 7.4.5+16.04.20171201.3

---------------
unity (7.4.5+16.04.20171201.3) xenial; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * InputMonitor: add an unity class that monitors XInput2 events and
    converts them to XEvent
  * EdgeBarrierController: use InputMonitor to get the barrier events
    instead of relying on its implementation
  * DecorationsMenuLayout: use input monitor for menu scrubbing (LP:
    #1614597)
  * PanelView: use InputMonitor to track menu events
  * LockScreenPanel: use InputMonitor events instead of mouse polling
    for menu scrubbing
  * MenuManager: add support for mouse trackers with triangle algorithm
    support (LP: #1618405)
  * PanelView: scale gradient refinement properly
  * PanelService: don't allow to deactivate menus if they've been opened
    too shortly
  * LockScreenController: ignore icon_paths_changed signal in
    menumanager for Lockscreen
  * LockScreenController: use InputMonitor to get all the events and
    hide the Blank Window (LP: #1321075)
  * LockScreenController: use input monitor to get the events to switch
    monitor (LP: #1316862)
  * LauncherOptions: use track_obj to manage option changes (LP:
    #1622995)
  * UnityScreen: toggle gestures recognition on lock (LP: #1645507)
  * GnomeSessionManager: add gcancellable to instance and use it for
    calls with temporary proxies
  * BackgroundSettings: use gnome-bg to generate textures with proper
    scaling (LP: #1666359)
  * UnityWindow: safely check validity of UnityWindow from scaled one
    (LP: #1659847)
  * Panel: ensure the menu-manager tracker is updated to match monitor
    (LP: #1671432)
  * compiz-profile-setter: tool to update the current profile and use in
    systemd and Unity settings (LP: #1668950)
  * BGHash, UnityScreen: get desktop averageColor from compiz
  * Launcher: disable or reduce most icon effects on lowgfx (LP:
    #1700859)
  * PanelController: ensure we disconnect from signals on destruction
    (LP: #1504870)
  * tools: add migration script to set the default values for unity-
    lowgfx profile

  [ Andrea Azzarone ]
  * Properly handle the file manager copy dialog in
    FileManagerLauncherIcon and in StorageLauncherIcon. (LP: #1575452,
    LP: #1609845)
  * Correctly position the force quit dialog when scaling is different
    than 1.0 (LP: #1637991)
  * GnomeSession: Retrieve the session id using dbus if $XDG_SESSION_ID
    is not set
  * Round gtk scaling factor to closest integer. (LP: #1649736)
  * Keep the screen locked if rebooting with autologin. (LP: #1600389)
  * Use g_mkdir_with_parents instead of mkdir.
  * Lockscreen: always draw the background-color in the lockscreen (LP:
    #1702701)
  * Refactor the way UserAuthenticator is created and passed around.
    Handle failures to create new threads and fallback to a "Switch to
    greeter..." button in case of failure. (LP: #1311316)
  * Wait until the color buffer is cleared before suspending. (LP:
    #1532508)

  [ Kai-Heng Feng ]
  * UnitySettings: If scale-factor is not set, find and set right scale
    for HiDPI displays.

  [ Eleni Maria Stea ]
  * shouldn't create blur rectangles when there's ...

Yes, it is fixed in artful.