I can reproduce this easily on a i965 laptop with Compiz turned on so am
marking it Triaged.

I tried running 'strace braid' but it didn't lock up at all - presumably
strace slows it down enough to not get into the locked up state.

In reading the man page for xscreensaver, I noted this passage which
might be of relevance:

       Machine Load
               Although  this  program  ``nices''  the  subprocesses  that  it
               starts,  graphics-intensive  subprograms can still overload the
               machine by causing the X server process itself  (which  is  not
               ``niced'')  to consume many cycles.  Care has been taken in all
               the modules shipped with xscreensaver  to  sleep  periodically,
               and not run full tilt, so as not to cause appreciable load.

               However, if you are running the OpenGL-based screen savers on a
               machine that does not have a video card with  3D  acceleration,
               they will make your machine slow, despite nice(1).

               Your  options are: don't use the OpenGL display modes; or, col-
               lect the spare change hidden under the cushions of your  couch,
               and  use  it  to buy a video card manufactured after 1998.  (It
               doesn't even need to be fast 3D hardware: the problem  will  be
               fixed if there is any 3D hardware at all.)


** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Confirmed => Triaged

-- 
braid screensaver crashes system with compiz activated
https://bugs.launchpad.net/bugs/101943
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