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gnome-shell eats the entire CPU (99% usage).

I work for a company that has a boat load of (or train load of) Dell Latitudes x686 laptops (circa 2008). We're try to install Fedora 23 on them. When I upgraded (dnf update) from the kernel that comes with the 23-ISO (from 4.2.3-300.fc23.i686 to 4.3.5-300.fc23.i686) and log in, the machine is almost completely unresponsive. If I leave the machine alone the CPU usage goes to ~19% BUT if I try to move a teminal window (e.g.) the CPU usage immediately jumps to 99%.

I run "top" and the CPU % for the gnome-shell is about 99%. I've tried using "gnome-tweak-tool" to disable the extention "Background Logo" in the overview "Extentions". This does not work.

So currently I select the 4.2.3-300.fc23.i686 kernel when booting. This works. if you don't try adding an external monitor. Even then if a try to add an (additional) external monitor, the problem reoccurs immediately.

More info: root@localhost ~# lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)

Any suggestions?