I have hp dv6-6c65sx specs

Microprocessor 2.2 GHz Intel Core i7-2670QM
Video Graphics AMD Radeon HD 7690M XT (2 GB DDR5 dedicated)

now when i install bt5r3 i have no problem at all starts really well and every thing but the vga card driver is BT5R3 default and doesn't give me the normal resolution for the screen and i wana run pyrit using gbu so i need the correct driver for the amd radeon hd 7690M XT

so every time i try to install the install goes fine but when i restart it gives me back screen after the startx i tried every thing there is installed every ver. from amd catalyst drivers tried every thing and read that the 7690 card doesnt have driver from amd for linux and i could use other driver for other card with same chipset so i did same problem always blackscreen after startx every time i install amd driver can any 1 help me with this issue ?!!!

thx in advance