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It's actually the opposite -- NS2 doesn't need more than 3.1, they need LESS than 3.1 -- the compatibility profile with deprecated OpenGL features is what causes issues.
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Intel does a lot of really amazing work for their Linux drivers. The Radeon drivers are quickly on their way to becoming the best drivers on Linux, but for the time being Intel probably provides the best GPU drivers. I'd even place…
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RadeonSI does support 3.1, if you're pulling daily git pulls. If you're on Arch Linux you could use this repo -- http://pkgbuild.com/~lcarlier/mesa-git/ -- to do …
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Does this have to do with anything other than the OGL version that Mesa uses? So, for instance, my 7970 with Mesa is currently at 3.0, and once the driver for *that* card hits 3.1+, Mesa should be able to run NS2 just fine, correct…
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Okay, this makes some sense. I've been using the radeonsi driver (experimenting with the foss drivers on my laptop) and iirc it only supports OpenGL 3.0 at this point. Hoping that'll get upped to 3.1 (even 3.3, I think) soon. …