BIOS A13, nVidia driver v310.90 and the flicker is back. Thank you Dell that I am back in the middle ages where we had 40Hz refresh rates and flickering screens. Latitude E6410 is a great laptop when it doesn't flicker or crashes because of the video adapter.
This is what worked for me:
I have a Dell Latitude E6410 i5-560m w/ nVidia NVS 3100M
Windows 8 Pro 64 bit
Video Driver: v310.90
Tried Video Driver: Version: A09-706459 version: 126.96.36.19979 - no change - still flickered.
Tried Video Driver: Version: A08-R287174 Version: 188.8.131.5222 - it worked, so far at least.
I did need to boot to safe mode in Win8 in order to downgrade from v310.90 to A09, but I did not downgrade system BIOS.
Well, I take it all back from my previous post. I left the laptop un-attended overnight and in the morning the screen DID NOT have the flicker. I left the laptop un-attended for a half hour and I HAVE the flicker. I think it is a hardware issue in my case.
I have installed latest nVidia v310.90, my BIOS v. is A04. I got flicker. I have changed the screen refresh rate type to DMT in nVidia Control Panel (change resolution> adjust button). The problem is gone at the moment and doesn't come back after wake up from sleep. I am not sure if this option is available in original Dell driver, I have used driver from nVidia site and INF file from laptopvideo2go. I needed new driver for CUDA to work correctly with DVD creator encoding software (worked ok, now encoding is few times faster, but I got flicker - now resolved).
I had this problem for 1.5 years with my E6410, went through two systems with the exact same issue, and now the third has no problem. First system was replaced on the day it arrived, second had 3 motherboards, 2 displays, and a whole bunch of other parts replaced with no fix, and the third has no problem.
The easiest way to get the problem is to set display sleep to 10 min, wait 15-20 min, and wake up the display. It will flicker like mad. If you have no warranty, the only fix i have found is to get a display modifier and force 75-90Hz refresh rate, but this will kill your battery. Otherwise, keep working with Dell until you get a full system replacement.
An update for my situation. The flicker problem occurs in Win7-64bit and Win8-64bit with all drivers I've tried to date. I do not get the flicker problem with Win7-32-bit, so it appears to be related to the 64 bit OS drivers in my case.