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How do I properly install / configure a Radeon HD 7850 for full functionality? Ubuntu 13.04 (same problem in 12.04)

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http://askubuntu.com – (Almost certain Wine is not to blame for this, unless I am unaware about a bug since 1.4 release) Uninstalled old Nvidia card, installed XFX Radeon HD 7850, tried to run a Steam (through Wine) game, outputs this: Your graphics hardware does not support all features (CSM) needed to run this game. Device Info: Marked unsupported: 0 Supports PCF Sampling: 1 DriverName: "AMD Radeon HD 7800 Series" Vendor ID: 0x1002, DeviceID: 0x6819 DriverHigh: 0x0006000E, DriverLow: 0x000A21E9 DXLevel: 95, MinDKSupportLevel: 90, MaxDXSupportLevel: 95 Has mildly laggy performance on desktop with full hinting, (HowTos)