Re: Random crashes, NVRM Xid messages
I don't use compiz. For what concerns metacity, compositing can be toggled via the configuration editor (apps/metacity/general) or from the command line, e.g. gconftool-2 -s --type boolean /apps/metacity/general/compositing_manager false/true. I use a shell script to turned it off/on when watching movies. It is straightforward to define a hotkey for that.