Strange flashing screen

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Hi everybody ..!
Well , I'm having a very strange problem with my Galaxy Ace.
it came from the carrier, in version 2.2.1 (Claro ,Brasil) , so I upgraded to 2.3.3 (Acevillain)

It was then that things got very strange.
The screen suddenly started to turn black , sometimes blinking , but the touch was still working ok with the rest of the phone !!
the only way to get back , was when I pressed the "lock" button , then the screen got loked and i unlocked.

Then I decided to downgrade to 2.3.3 (original) and i got a little improvement
. Now,i did the total downgrade to 2.2.1 and the problem has almost sttoped , if completely

What could be happening?
I dont know why , but why the galaxy dosent have a auto-brightness option ?

essas roms nao funfam nos nossos.. ficou igualzinho no meu..

eu atualizei pro 2.3.4 da vivo.
ficou filé!

q isso davebyone!!
me manda por favor amigo!!!


Our friend has just said that he too had the problem , and custom rooms dosent work in our phones (from brazil) and he has a 2.3.4 from one operator from here!

Please, I'm also from Brazil, can you share this rom from Vivo with us? I had those problems and I swap my phone with a new on Claro.

Por Favor, compartilha pra gente essa rom!

SOLUTION!!
thanks to ltertok and FMAranda
there's a solution for south american phones!

http://forum.xda-developers.com/show....php?t=1144575