I'm having exactly the same issue and thought I would add my $0.02, having just found this forum after dealing with this problem for the past month or two. I bought a Targus ACP71USZ for my Ivy Bridge laptop around May, and have been having problems w/ fullscreen gaming since then, but to be honest I didn't do much PC gaming previously (was mostly on PS3) and didn't put 2 and 2 together that it was the dock drivers causing the issue.
However, today I just happened to chuck a SSD into my laptop as well, and reinstalled the OS and all software from scratch. As it happened, the DisplayLink driver was just about the very last thing to go on. Steam, conversely, was put on this morning, and I checked each of my 12 games earlier, as I installed them, verifying that each and every one was working fine in full screen condition (I even made a sys restore point at that juncture as I was so tickled to have apparently resolved the problem). However, immediately following the install of the latest DL driver (7.6.5563), all of the games I'd had trouble with immediately broke again.
Not that it really matters, obviously a ton of people are having exactly this issue, but here's my set up:
Windows 7 Home Premium (newly installed, fully updated)
Sony SVS151190X
Newest Intel HD4000 driver (10.18.10.3621)
Newest nVidia GeForce GT 640M LE driver (9.18.13.4043)
Newest Intel USB 3.0 eXtensible HC driver (1.0.10.255)
Newest Intel 7 Series/C216 Chipset HC driver (10.0.13.0)
Newest version of GeForce experience, etc., etc., etc.
And the score as to the games:
Unaffected games:
Awesomenauts
Dota 2
Affected games:
Borderlands 2 (not a big deal, can be set to run 1080p borderless window)
Left 4 Dead (ditto)
Left 4 Dead 2 (ditto)
Crusader Kings II (will run FS, but only at greatly reduced refresh rate of 25Hz)
Dungeon Defenders (will NOT run FS no matter the setup, and there is NO option to run borderless window, nor does any 3rd party full-screen wrapping software I can find work with this game; in otherwords, you will be absolutely stuck running it in a standard window if you load DL drivers)
Civ V (like CK2, has refresh rate problems w/ DL drivers installed but can be made to limp along)
The Witcher 1 + 2 (appear to have 1 working for now; 2 will only run after alt-tabbing over to close the Direct3D error message, and this will leave the taskbar on the screen over the bottom of your game for the rest of the session).
As with everyone else, this happens regardless of whether the machine is plugged into the dock or if a monitor is attached directly via HDMI or VGA, or even if the laptop is just outputting to its own built-in 1080p screen.
It's not the end of the world, the dock is still pretty useful to me (though not as useful as Sony simple separating the HDMI and VGA ports by another half-inch so I could plug in both outputs simultaneously might have been) and the -window -noborder switch is a great workaround for those games where it can be implemented, but it IS a drag not to be able to properly play one game (Dungeon Defenders) at all, and have to have to use obnoxious settings w/ three others (CK2, Civ 5, Witcher 2).
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