Problem with ATI Radeon HD Mobility 5145

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http://ubuntuforums.org – I have a Asus K52JB and my video card is ATI Radeon Mobility 5145. Jusr for some information i read here : http://ubuntuforums.org/showthread.php?t=1678044 that the card is based on the 4500 series. So if i just don't install nothing, in "System Details">"Details" it tells me that my graphics are "Gallium 0.4 on AMD RV710". I've tried to install fglrx drivers and AMD site drivers too but always gives me some problem. On ubuntu 13.04 and 13.10 if i install these drivers, when i reboot the resolution is very bad and my unity and side bar doesnt show ( tried t (Hardware)