Problems with w520 and DisplayPort monitor

Is anyone else noticing Any of the following problems using a monitor connected to the w520 using DisplayPort and Lenovo Windows 7? -
When the monitor's power saving is activated by the operating system, and is then woken up, the resolution is badly mangled. It's as if the screen is very heavily zooomed in. The only way I know to fix it is to start the Nvidia control panel by right clicking on the desktop, and selecting resize from "adjust desktop size and position"
Worse still, after fixing the "zoomed in" problem, the color bit depth appears to be drastically reduced, so that smooth gradations of color (for instance from light to dark) are replaced by blocky transitions that look terrible.
I'm noticing this problem on an 24" HP LP2475w running at 1900x1200, 32 bit. This is a professional quality wide gamut monitor. I never had these problems when it was previously connected to a T400s.
Nvidia driver version is 8.17.12.7593, downloaded from the Lenovo support site. Windows is running the latest Microsoft and Lenovo updates. The BIOS is the latest version, 1.34.
Does anyone have any ideas?
Solved!
Go to Solution.

Thank you for the replies everyone. I have installed the drivers as suggested, but unfortunately the problem persists.
I neglected to mention that I'm already running the BIOS in discrete mode only, because I use Linux heavily and optimus doesn't currently work under Linux. I have never seen the problem when using Linux.
I can add a few more details, which I neglected to mention last time. When the problem occurs, and the computer is being shut down, the posterization problem persists even with the generic Windows is shutting down screen. I don't know enough about Windows to know whether the Nvidia driver is being used to output that or not.
I'm confident it's not the monitor or the cable. In fact, I'm certain it's not because I just switched the BIOS to Nvidia optimus to see if it would be any better than that mode. to test it, I attached two external monitors (one VGA and one DisplayPort), and had the laptop lid open. As soon as I booted the machine, the problem reemerged once the login screen appeared: the DisplayPort monitor was heavily zoomed in, and the colors were posterized. I reset the screen size using the Nvidia control panel ( which does not fix the posterization problem), rebooted again, and this time the DisplayPort monitor was fine, but the laptop screen was heavily zoomed in. Another problem occurring simultaneously after this second boot with Optimus enabled is that the display resolution on the laptop is fixed at 800x600 instead of 1920x1080. Intriguingly however, the laptop screen's color reproduction is not posterized.
I have no idea if the problem is with the driver or bios.

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Thank you for your answer.
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there are plenty of instances where the official driver have glitches... just look around the forum to find instances of which.... while official drivers maybe better in most instances, there are always the odd case where it doesn't work as well as it should. If they perfectly out of box, then there would never need to be multiple revisions and updates.
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