Hi,
You should try using the kernels of the official BSPs, like 3.10.53 or 3.14.38.
Additionally, you could refer to the following document from the Community, in case that you are using LVDS display:
Porting LVDS LCD With Low Resolution to i.MX6
The following thread could also be useful for you:
Frame buffer resolution in i.Mx6 Yocto
Hope this will be useful for you.
Best regards!
/Carlos
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