T430 screen flicker in Discrete Graphics Mode (BIOS)

Question

I recently bought a t430 with both igpu and dgpu 5400m and I'm loving it.
When I first received it I tried to connect it to a TV but it had issues which I later found was due to Optimus. So I followed a solution that suggested that I switch the BIOS Graphics mode to 'Discrete Graphics' instead of 'Optimus (default)'.
But when I changed to Discrete, I get an artifacted Flicker on the screen whenever there is a hardware acceleration (not sure if thats the right word for it).
For instance if I move a folder window around the desktop, the moment i start moving it and hardware acc kicks in, i get this flicker. Then when I let it go and hd-acc turns off then I get anoter flicker on the screen. I can reproduce the flicker everytime I maximize and minimize a window/page that has animation/high fps content. If I run a game on it then the flicker occurs only once at the begining, and repeats after i minimize/exit the game.
I tried fraps to capture it and whats funny is that when I play that capture on my laptop I can see the flicker, but when I run the same video on my Desktop, i dont see any flickers in the video at all. Could be my laptop flickering to the Video Playback.
My NVS Drivers are up to date. 320whql

Answer 1

engr_ali,
Are you connecting via external VGA or displayport?   If you have tried driver and setting changes as suggested by others, and if you are using a VGA connection, see if you can connect your external display via the display port connection to see if the symptoms go away.
Mark
ThinkPads: S30, T43, X60t, X1, W700ds, IdeaPad Y710, IdeaCentre: A300, IdeaPad K1
Mark Hopkins
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