Honestly, Intel integrated graphics have been getting better very quickly recently, and already have pretty good Linux drivers. Maybe you wouldn't want to run Crysis on them, but for, say, Team Fortress 2 it should be good enough.
What can you run with the latest Intel Chipsets ? I haven't been following up on their progress. Are they somehow closing some of the gap between integrated graphics and dedicated GPUs?
Both Ivy Bridge and AMD's new Trinity IGPs offer playable frame rates at low-medium settings in many newer titles, with Trinity generally having a slight edge:
