popular video cards on the market.
.. And the two that prefer to make proprietary drivers rather than, if they want the speed and quality, making their work fully open..
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okay so start running down the chipsets on boxed computers (the former M$ market)
Dell, Compaq ,HP all use either Nvidia or ATI chipsets mostly. This means that the biggest market for Linux will also A Not care about "free -(L,G)" B Know the least about the pain part of Linux
These folks just want it to work after M$ decides that M$ doesn't Kernel , X, Multimedia and basic office/network should be "Stop Presses" level bugs by default. If Joe Luser can boot the system with X, play cds/mp3s, type notes, surf and go online it can ship but if those things can't be done DO NOT SHIP (or plan on shipping a patch disc)