Xnest: ghost mouse

Speculated that this might have something to do with the fact that I was using the proprietary nvidia driver. Nope: switching back to the nv driver had no effect.

Did some tracing and I'm pretty sure this is an upstream problem.
Those interested can follow the exciting saga here:

https://bugs.freedesktop.org/show_bug.cgi?id=10096

Beh, after a whole bunch of tracing I determined there was no problem in xorg. The problem is actually in gnome-screensaver. Filed another bug, created a (tentative) patch. See here:

http://bugzilla.gnome.org/show_bug.cgi?id=412486

Changing product.

William,
Was the problem solved with your patch? Have you tested it?

I have tried this patch and it works fine. Xnest is working as expected.
Thanks, William.

Just for learning debian package process, i've made a new ubuntu version of this package, i'll attach a debdiff.

Thank you for the patch Jonh, I've uploaded the fixed version:

 gnome-screensaver (2.17.8-0ubuntu2) feisty; urgency=low
 .
   * debian/patches/02_ghost_mouse.patch:
     - Make gnome-screensaver not watch for mouse motion events from windows
       which haven't registered for such events (LP: #84662)
       Thanks to William Lachance for the patch

I am seeing the same issue (Xnested xeyes appears to update only when the pointer crosses the Xnest's window edges) with Ubuntu 8.10. However, killing gnome-screensaver (2.24.0-0ubuntu2) didn't remove the problem, which I imagined should have helped, if it is to blame. Perhaps it should've been terminated in a way other than plain kill?

I am running the NVidia proprietary drivers, but as the bug is cunningly similar to this one which had didn't involve NVidia, I'm thinking that's not the case here either. I also verified the bug from another Ubuntu 8.10 user. (unknown setup)

I tried running xev -id $winid_of_Xnest, and received no output when moving the pointer across the Xnest window.

Could there be another process interested in my pointer movements? I'm running the following X clients: applet.py audacious bluetooth-applet evolution-alarm-notify evolution-exchange-storage firefox gnome-netstatus-applet gnome-panel gnome-power-manager gnome-settings-daemon mixer_applet2 mrxvt nautilus nm-applet notification-daemon rep rxvt seahorse-agent tracker-applet trashapplet update-notifier x-session-manager xemacs xterm.

Btw, the actual issue I originally have is not getting the mouse pointer move in Warsow :-), but bugs on that were marked to be duplicate of this.