Originally Posted by zaclimon
Hmm, it might be related to either the toolchain updated to 5.1 or maybe the optimizations I've added into V2.
What rom are you using? You may have some issues because you used a rom that was based on CM.
I used to be on CM12+SM franco, but I migrated back to stock google factory image since 5.1 was released. Wiped and reflashed all partitions including boot and recovery to make sure I had a fresh start. After that I started having the graphic and touch problems, with stock kernel and quanta v1. One thing I hadn't flashed was the touch driver fix I mentioned earlier, which I used on kitkat, because the nature of the problems seemed different.
Now that quanta v3 made my touch screen behave identically like it did on kitkat without the fix (i.e. fixed the graphic glitches I was having) and have been like this consistently for the last few days, I decided to flash the fix to see if I achieved the desired result, which as far as I can tell from a few minutes of using it, it has.