MacBook Pro not detecting display resolution properly on Leopard 10.5.2

I have a 15" 2.2ghz MacBook Pro that I recently upgraded to Leopard. When I am home, I connect the MBP to a USB keyboard and mouse, and a Samsung 226BW 22" display using a DVI cable. Prior to the Leopard upgrade, I could connect the components, close the MBP, hit the spacebar on the USB KB and the MBP would wake up using the Samsung in its native resolution of 1680x1050.
Since the upgrade there are two major problems. I can no longer wake the MBP up with the KB. It sounds like it is waking up, the Apple logo illuminates for a moment, then it immediately goes back to sleep. Secondly, the MBP is not detecting the correct resolution of the monitor. It shows both as being 1440x900 no matter what. Under the system profiler, it has exactly the same description for both the MBP display as well as the Samsung 22". I have already read other posts and performed the following:
Reset the SMC
Reset the VRAM
Trashed the windowserver.plist and rebooted
Any ideas on why this may be happening? Thanks in advance.

You are not alone. Spent over an hour with AppleCare support. The engineer was fantastic, but when he got out of his area of expertise and tried to take me to level 2 support, the level 2 folks said 'contact samsung' That's obviously a delay tatic. This is very clearly a 10.5.2 upgrade issue. My external 24 inch samsung display was working fine prior to the upgrade and now it's stuck on 1440X900. They took me through PRAM resets, cache clearing, plist removal etc.
Very disappointed to see Apple take a very microsoft like stance to a problem that is obviously a bug in the graphics drivers for 10.5.2. The engineer also indicated that this was a known issue, but the docs on it are 'eyes only'. I question that culture as well.

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