During the development and testing of GRID Autosport we encountered issues with AMD & Intel graphics drivers that we could not work around.

However, we found that by disabling some of the more complex settings and rendering options in the engine that depend on features missing in the RadeonSi/Mesa drivers, these drivers can be used to successfully play the game. Right now the driver version and support required does not ship by default in the latest version of Ubuntu, so the game will remain unsupported at this time.

In the future, when these latest drivers become supported by default, we will look at extending full and official support to AMD and Intel graphics cards.

Below are some basic details for users who have AMD or Intel hardware and would like to attempt to play the title. This is for information purposes only, and we do not support or recommend you attempt to update your OS unless you fully understand what you are doing.

AMD Information
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On Ubuntu 15.10, the 11.0.2 driver is provided, yet it only supports GL 3.3. Of note, it lacks the GL_ARB_gpu_shader5 extension which this game needs. Without this feature you will see some graphical issues which go away with GL_ARB_gpu_shader5 support enabled.

Mesa drivers need an LLVM version of at least 3.7 for GL 4.1 support, but Ubuntu provides only LLVM 3.6. Therefore, Ubuntu 15.10 users wishing to use GRID Autosport with RadeonSi will need to obtain a newer LLVM outside of Ubuntu's official packages and use a Mesa built against that.

The specific driver version required is 11.0.2 or later however you need to make sure that the driver is compiled against LLVM 3.7. Until the LLVM 3.7-compiled driver is made available to the public in a shipped Ubuntu OS we cannot officially support AMD GPUs.

Intel GPUs
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We found an issue inside the Intel driver that caused severe rendering issues. This has since been fixed by Intel in the Mesa trunk, but has yet to be released to the public in an official driver. Once this fix has been pushed into a release driver then the game should render perfectly well and you can play on the Intel Iris Pro chipsets.

The specific changes are:

http://cgit.freedesktop.org/mesa/mesa/commit/?id=3e9003e9cf55265ab1fb6522dc5cbb2f455ea1f9
http://cgit.freedesktop.org/mesa/mesa/commit/?id=3810c1561401aba336765d64d1a5a3e44eb58eb3

We will update this post with more details in the future.