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build-dkms in steamos-base-files doesn't deal with old Radeons properly #163
Whilst the official hardware specs for SteamOS state it needs a Radeon HD5000 or newer (aligning with the latest FGLRX driver), plenty of people have been trying older cards regardless.
The following modification to steamos-base-files will cause build-dkms to use mesa's GL implementation, not fglrx's, on cards which fglrx does not support.
2 changes need to be made to default.preseed to allow smooth installation on these older cards, but I'll file a separate issue for those modifications