So I have managed to track this down.  Here are the steps I'm doing to figure 
this out:

1. Boot the system with "-m milestone=none -v"
2. Once I get a command prompt, I type "mount -f ufs -o remount,rw,nologging 
/devices/ramdisk:a /"
3. Type the following:
mkdir /bak
cd /kernel/drv
mv * /bak
mv /bak/[a-m]* .
devfsadm
4. Repeat #3 but keep eliminating letters of the alphabet.

What i found was that devfsadm would give me an error if I removed the devinfo 
kernel module but as soon as I had ONLY the devinfo module and ran devfsadm and 
the screen corrupted.  I did the following on the last iteration:

mv * /bak
mv /bak/dev* .
devfsadm

at which point the screen would corrupt.

If I did an ls of /kernel/drv before running devfsadm, the only files that 
would be listed are devinfo and devinfo.conf.

My conclusion is that my screen corruption has something to do with either the 
devinfo module or something with devfsadm since I cannot load other modules 
without devinfo being loaded, I can't say for sure.  This problem started on 
Build 22 and did not happen on Build 21 and is still happening on Build 24.

I really hope this helps someone at Sun get to the bottom of this.

If you need more debug information or want me to run this through the kernel 
debugger, let me know.

Thanks.
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