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Rocket League ingame artifacts

radeonsi on mesa 19.2.0 / GFX8. This is unrelated to #1888 (closed).

While ingame, some artifacts randomly appear, most frequently when a countdown is displayed on the OSD at the start of a game. It's very brief so I haven't been able to take a screenshot of it.

AMD_DEBUG=nodma seems to fix the issue. I played two games in a row without any artifacts, while I usually get several of them during a single game without the flag.

SDMA image copies were already disabled by 6b3ee869, it seems that SDMA buffer copies are also problematic and should be disabled.

Edited by Clément Guérin
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