X stops receiving mouse clicks

Peter Hutterer peter.hutterer at who-t.net
Tue May 12 17:11:42 PDT 2009

On Tue, May 12, 2009 at 04:35:51PM +0300, Marius Gedminas wrote:
> On Tue, May 12, 2009 at 05:57:00PM +1000, Peter Hutterer wrote:
> > no, actually. this is how input devices work. the physical devices are
> > abstracted away through the virtual core pointer. all events go through this
> > core pointer device, and if an application grabs it then events are no
> > longer sent to anyone else. same with the keyboard.
> > hence if you have a rogue grab, all devices seem to stop working.
> Are there any debugging facilities for finding out which X client has
> the grab?
> I once spent an hour killing all processes one by one until I found the
> one responsible (gnome-settings-daemon):
> http://mg.pov.lt/blog/xorg-snafu.html

if you have a second machine you can ssh+gdb in and look at
CLIENT_BITS(inputInfo.pointer->deviceGrab.grab->resource). this should give
you the client mask for the grab, and with xwininfo -root -children -all you
can then match that up with a running client (that's from memory, no


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