Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - Technical Issues Arch Linux Crash on Launch

I'm running into the same issue on Debian Jessie 8 and the open source AMD driver. My GPU is rather old (Mobility Radeon 4860). It appears that I have two insurmountable obstacles to getting the game running. Firstly is the fact I'm using OSS drivers; don't really have a choice since my GPU is no longer supported by AMD. The highest OpenGL revision of OSS driver is 3.0. The second strike against me is the age of my GPU. Even though it was capable of running Skyrim when I had windows on that PC, it seems that Original Sin is out of reach. The specs I've managed to find on this GPU indicates that the max OpenGL it can handle is 3.1.

Now here's the really baffling part. My ancient iMac has a Radeon HD 2600. Even though it is two full generations behind my PC laptop, it can run Original Sin (admittedly at very low settings.) Why is Linux getting the short end of the stick?