The test kernel of #57 works well for me. Before I could trigger the hangs immediately and frequently (every few seconds) when running the linuxcnc simulator (heavily using mesa GL I guess) on an i9-9900K desktop and kernel 5.3.0-46, that is gone with the test kernel. I never saw the problem on my Dell XPS13 9343 (i7-5500U, running same 18.04 OS and 5.3.0-46 kernel), by the way.
The test kernel of #57 works well for me. Before I could trigger the hangs immediately and frequently (every few seconds) when running the linuxcnc simulator (heavily using mesa GL I guess) on an i9-9900K desktop and kernel 5.3.0-46, that is gone with the test kernel. I never saw the problem on my Dell XPS13 9343 (i7-5500U, running same 18.04 OS and 5.3.0-46 kernel), by the way.