how do patches get to Debian kernel package?

[Mark Copper <mlcopper@gmail.com>]

Hi Debian users,

Upgrading from old stable (Lenny) to stable (Squeeze) broke X on my
machine.  The problem centers around the video chip on the Asus M2A-VM
motherboard, and, perhaps the attached Samsung monitor attached.

I am not certain, but I believe this discussion at lkml.org pertains:
   https://lkml.org/lkml/2011/6/21/244
where a kernel patch for the problem is proposed.

My question to this list is a request for a sketch of the process how
the patch discussed at lkml.org would get into Debian's kernel image
package.  Is there a resource where I can see whether the patch was
indeed accepted into the Linux kernel source?  What roughly, is
process to get from there to a compiled Debian package?

I'm sure it's all out there, but a few words from a knowledgeable
participant would be greatly appreciated.

Mark