I installed UT2004 on my old T460 running Arch. Everything works fine and the game runs actually great even with everything turned to max, but every 20-30 seconds my mouse acts erratically, resulting in sudden and extremely disorientating direction changes. I turned the tracckpad and pointer off, just in case those were the source of the problem, but that didn't help.

Running the native version via Lutris/proton is a lot worse, fps-wise, but the problem doesn't seem to happen. Other games and application run fine.

Any idea or solution?