A bit more information:

I performed an strace as well and got the same results as Chris does
above.  I took the IOCTL code and decoded it according to the
documentation in the Linux Kernel.  Based on that, it decodes to a
Read/Write IOCTL in driver 'd', function 3A.  Driver 'd' is assigned
(primarily) to the drm driver.  The drm driver uses function 3A for
DRM_IOCTL_WAIT_VBLANK.  Unfortunately, that's about where my
understanding died.

I'm trying to figure out where it's called in the X code, but I'm not
sure where to track it down.  Maybe, however, this will help someone
else figure it out.  :)

-- 
[intrepid] X locks up or crashes when screensaver activates
https://bugs.launchpad.net/bugs/262605
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