Hello there,
I've just got myself a brand new Dell U2713H, rev. 07. I'm using it connected via display port to Apple Macbook Pro Retina notebook.
It has a tinting issue which is pretty common I believe across wide-gamut Dell displays (I've found threads going back as far as 2009) making left half of the screen greenish (tint) and the other half - reddish.
Switching color spaces / adjusting color channel gain is useless because it accounts for all display, not a portion of it hence you'll see the difference either way.
I have two questions:
1) Whether this issue is covered by Dell warranty
2) and if this is an isolated issue, i.e. through manufacturing, not a panel-type issue.