We are facing problem loading tiles of FlightGear 2.8.0v on Ubuntu 12.04LTS, but the same version of FlightGear is running smoothly on Windows 7 OS.
Certain observations in Ubuntu 12.04LTS are :
1. Far Tiles loading are clearly visible on the screen.
2. Frame update rate is decreasing drastically while loading the Far tiles.
3. Frame rate is not synchronized with monitor refresh rate.
Below are my system configuration
PC : HP Z800 workstation
Processor : Intel Xeon(R) CPU X5660 2.8GHz x12
Memory : 16GB DDR3
GPU : Nvidia Quadro 6000 (6GB)
please let us know if there is any patch / work around to solve this problem. plz revert back if additional details is required.