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Yeah, my version of mesa is already fully updated. It would support OpenGL 4.5, but the driver for my graphics chip (Intel Ironlake) only supports 2.1. That other user must have more recent hardware. Mesa is more like the 3d graphics programming library than the driver for a particular graphics chip.

Thanks again for the thoughts.

Yeah, I guess there probably is a good reason it's using a new version of Unity and very unlikely to be rolled back. I did try the Windows version under Wine, but was unfortunately only able to produce a black screen.

Oh well. I can keep playing A17 if I want, and maybe someday I'll get a new computer.

Thanks Calahan.

I researched this issue a bit more and think I've gotten to the bottom of it, but unfortunately there's no fix for people who are experiencing it. It's not actually specific to Linux but rather to slightly older graphics chips.

1. As you pointed out, it seems RimWorld B18 uses a new version of Unity.

2. This new version of Unity insists on graphics hardware that supports OpenGL 3.2 or later. The Unity version for A17 works with OpenGL 2.1 (possibly earlier as well).

3. My system has slightly older graphics hardware: Intel Ironlake, first sold in 2010. Intel has never written a driver (Windows or Linux) that supports OpenGL later than 2.1 for that hardware. The driver is open source, so in theory someone could write a new version that implements a more recent OpenGL. But it sounds like that hardware is too old for anyone to care.

I guess the question on my mind is: Does RimWorld really need this new version of Unity?

Is Tynan using some new feature it provides, or was this switch essentially an accident? Can he switch it back?

It would be a real shame if a bunch of people with ~5 year old computers can't play RimWorld anymore for no good reason. It's not like Ironlake graphics isn't fast enough -- A17 runs perfectly.

I seem to be having the same problem on linux.

Alpha 17 (version 1557) is working fine for me, though only when I run it with the "-force-opengl" flag. But I can't get Beta 18 (1722) to start up, with or without that flag. See attached for the log files (1 is with "-force-opengl", 0 is without). I'm on Ubuntu 16.04.

RimWorld Beta 18 does run with "LIBGL_ALWAYS_SOFTWARE=1" however, but that reduces performance. Haven't tried it long enough to see if it's playable that way.

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