$ apt-cache policy fglrx | grep Installed
  Installed: (none)
$ lspci -nnk | grep VGA -A3
+03:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI RV770 [Radeon HD 4850] [1002:9442]
	Subsystem: Advanced Micro Devices [AMD] nee ATI MSI R4850-T2D512 [1002:0502]
	Kernel driver in use: radeon
	Kernel modules: radeon