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