Huge problem with AMD A-Series APU

First of all I have noticed that budget Intel CPU's work very good with trisquel and gnu/linux distros in general but I have this huge problem with a APU, namely the AMD A8 6600K black edition. This may be a black edition APU but it is still performing slightly weird because trisquel is displayed on half of the screen size. I had this problem with the old version of Trisquel but it keeps performing pretty bad even with the new one. BTW I love the new trisquel and it performs tons better than other mainstream distros, it is very user friendly but there seems to be a lot of room for work on mid range AMD APUs. So basically the problem is that I sometimes have to restart my pc 2 times just so that it can come back to normal and display the os on the entire screen instead of displaying on half a screen. I have used Gparted for proper RAM allocation and yes it has enough ram as I have 16 GB of DDR3 ram and the sistem is completely new.... can someone work on the drivers of this APU? this apu was selling for literally peanuts as it is a budget solution so I really hope that someone would work on this project in the near future.