Erm, your dmesg output shows that you're running 5.3.18-lp152.36-default, which is the official update kernel, and not the test kernel I've provided. It's likely because you didn't choose explicitly the kernel to boot at GRUB menu. The test kernel has a smaller version number, 5.3.18-lp152.1.1.g00a927a, so please choose this kernel at GRUB boot menu, and test with it. BTW, you can check the version of the running kernel by "uname -r" command.