Old laptop, resolution. Help me, i'm dumb.

[L1KDE]

Hi mates!

Can anybody help me with CRU settings for and old laptop?
It's native resolution is 1366x768 on AMD Mobility Radeon HD 5000.
I've tried just to x1.5 it. As i calculated it is 2049x1152.
I made it in CRU with Automatic PC timings.
I've been reading about scalers and limitations. And got turned on GPU scaling in Radeon settings.

But when i'm trying to turn it on - all i get is black screen.

Maybe someone can just tell me proper settings for those kind of screens to enlarge it somehow?

Pls don't be angry on me, i'm dumb at it, and english language is quite hard for me.

Thx.