Hmm..all these reports about one side being brighter, sounds like LG.Display have some very bad QC issues at the moment (a similar issue has been seen on the newer WU4 panel in the HP 2475w).
Hopefully someone else will see IPS is becoming popular and do a better job than LG.Display. It's Hitachi technology anyway originally.
Reading the HP thread then, do you think that it should get a bit better with time?
I didn't have mine that long / get much use before I had to send it back, so it's still got relatively low hours on it at the moment.
The annoying thing is that it seems it's the reduction in back light that has made it more apparent
The rest of panel is great so I don't really want to exchange it.