Dear Sir,

I'm using ArchLinux distribution. After kernel upgrade form 4.19.14 to 
4.19.15 my X environment stopped working. I have AMD HD3300 (RS780D) 
graphics card. I have bisected kernel and found a failing commit:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v4.19.20&id=ec5471c92fb29ad848c81875840478be201eeb3f

I'm attaching Xorg.0.log file

Best Regards
Krzysztof Grygiencz