Anyone else using Ubuntu 18.04 or one of its derivatives (e.g. Mint 19.1) and getting bad performance and/or weird issues when running Quakespasm -- as in brush faces flickering in and out of existence, the game freezing for several seconds, or outright crashing with an error message that says "i965: Failed to submit batchbuffer: Input/output error"? I've tried three different distros now, all based on Ubuntu 18.04 and all with the same problem. This is on a machine with Intel integrated graphics, for what it's worth.

I've tried googling and searching around on Linux forums, with little success (perhaps because I know too little to even know what to search for). Thought maybe someone here might have run into the same issues and/or know what the solution is and/or be able to point me in the right direction...