Default [Q] Guroscope not working on s4

Hi guys,

I have installed the pac ROM with this kernel: 3.4.92--KT-SGS4-KK4.4-AOSP-INTL-06.09.2014--KTOONSEZ #1. I have a GT-I9505 s4 and I have found that the gyroscope is not working, The phone won't flip screen to landscape, and I can't play any car games that need you to tilt the screen for steering.

I have spoken to the PAC man, and he told me it's not the ROM that's the problem, but the kernel. My question is, how can I fix this issue? Load a different kernel? if so, can I do that without wiping everything off my phone? I have rooted a few phones before so not completely newbie, but not that familiar with it all either.

Apologies if this is the wrong place to post this!

Thanks in advance,