(2) Hold up a bit updating your source trees...

[Matthew Dillon]

    I am only 70% confident that I found and fixed the issues.  If people
    get crashes with the MMX/XMM optimizations turned on and do not get
    crashes with the optimizations turned off, please post to bugs at .

    the MMX/XMM optimizations can be turned on or off in /boot/loader.conf
    via 'kern.mmxopt=0' or 'kern.mmxopt=1'.  It's a boot-only variable,
    sorry.  If the option is not present, the optimizations are turned ON
    by default.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>

:
:    Putting this in your /boot/loader.conf:
:
:    kern.mmxopt=0
:
:    Will turn off the FP copy code which is causing the X server problems
:    (and probably other problems as well).  
:
:    I should be able to fix the problem today, since I can reproduce it so
:    easily!
:
:						-Matt