Xorg hangs on >= ~2.6.31 with Intel i915 driver

[Dave Hansen]

I've been seeing hangs when X starts up with newer kernels.  I sometimes
get a cursor on the screen, sometimes not.  I can move the cursor when I
can see it, but I can't switch to a text console.  Sysrq works.

I bisected down to this commit:

commit 176616814d700f19914d8509d9f65dec51a6ebf7
Author: Zhenyu Wang <zhenyu.z.wang@xxxxxxxxx>
Date:   Mon Jul 27 12:59:57 2009 +0100

http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=176616814d700f19914d8509d9f65dec51a6ebf7

However, backing that commit out of current mainline
(v2.6.33-rc2-302-gc5974b8) doesn't seem to do any good.  It didn't back
out cleanly so I did it by hand and could have easily made a mistake in
the process.

Doing this:

	http://sr71.net/~dave/linux/xhangs/fix-config.patch

to the config worked around the issue in current mainline, although I'm
not quite sure why.

Some additional debug information is here:

	http://sr71.net/~dave/linux/xhangs/

including X logs and dmesg from a bunch of boots. 

-- Dave

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