Thanks for the information and very good quedtion....:good:
Here is my wild guess because the chipset is using in the tf700t, cortex-a9 t33...
I checked the diffs on gcc4.7 and gcc4.9 and tried to match all libraries in hope that I could narrow down the bug but it was failed. There was one time that I succeeded boot into the tf700 with my compiled gcc4.9 and thought that I found the bug but if I rebooted it, it got back to the graphical issue, flicking screen...
If I rebooted a few more times then the tf700 was working again. I did all my best to figure out the bug but it was a big failure at the end. That is how far it goes as of today...
I don't know enough to solve the mysteries and hope that someone else will....:fingers-crossed: