Can't set my resolution to 1080p

[kindofpop]

Hello, By default i dont have 1080p resolution so when i try to add it using xrandr i get an error.

Code: [Select]

mateusz@MateuszPC:~$ gtf 1920 1080 60

  # 1920x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 172.80 MHz
  Modeline "1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync

mateusz@MateuszPC:~$ xrandr --newmode "1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync
mateusz@MateuszPC:~$ xrandr --addmode CRT1 "1920x1080_60.00"
mateusz@MateuszPC:~$ xrandr --output CRT1 --mode "1920x1080_60.00"
xrandr: Configure crtc 0 failed

HD6850, fglrx-updates driver, Samsung S22C150 Screen, danke