I have a ATI Radeon 7730M Driver, and have the Catalyst Control Center installed. I have an external monitor with recommended resolution of 1920x1080 and the laptop's inbuilt monitor 1366x768. Whenever I connect the external monitor to my laptop as an extended monitor, the screen starts flickering. It doesn't do so when I mirror the displays, or change the GPU to the inbuilt Intel GPU.
I tried using the command when on the ATI GPU
xrandr --output LDHMI1 --auto --left-of LVDS1 --output VGA1 --auto --scale 1.0001x1.0001
The flickering stops then, but the screen doesn't load correctly, with the 22'' external monitor having only 15'6 of the screen working, and on dragging anything beyond that it loads in the laptop's inbuilt monitor.
Please do suggest what to do so I can use my AMD GPU and the external monitor without any further issues. I am using Ubuntu 14.04
This is the output of
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 LVDS1 connected 1366x768+1920+0 (normal left inverted right x axis y axis) 344mm x 193mm 1366x768 60.1*+ 40.1 1360x768 59.8 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm 1920x1080 60.0*+ 50.0 59.9 1920x1080i 60.1 50.0 60.0 1680x1050 59.9 1600x900 60.0 1280x1024 75.0 60.0 1280x800 59.9 1152x864 75.0 1280x720 60.0 50.0 59.9 1440x576i 50.1 1024x768 75.1 60.0 1440x480i 60.1 60.1 832x624 74.6 800x600 75.0 60.3 720x576 50.0 720x480 60.0 59.9 640x480 75.0 60.0 59.9 720x400 70.1 DP1 disconnected (normal left inverted right x axis y axis)