Perhaps this post doesn't really fit in here but I didn't want to create a new topic for this.
I have some issues with TLD (GoG version) on my two Gentoo Systems since at least v1.62 of the game.
On my Notebook (with radeon kernel driver) I cannot start the game with mesa-19.3.0_rc1 or newer. On startup I get a floating point exception and the game stops to run immediately. Going down to mesa-19.2.x "fixes" the issue and I can successfully start the game. This doesn't happen on my Desktop machine with amdgpu kernel driver where I run mesa-19.3 successfully since the first release candidates.
On my Desktop (with amdgpu kernel driver) while playing the game I get lots of screen artefacts and minor screen corruptions. I first thought this was mesa-19.3 related but going down to mesa-19.2 didn't fix the issue. Most artefacts can be seen at the player's right hand when holding the rifle or being spread over the whole screen when aiming with the rifle. I didn't check the bow yet though.
Here are my current specs:
GPU: Tonga PRO [Radeon R9 285]
CPU: 2x AMD Opteron 6328
GPU: AMD FirePro M6100
CPU: Intel Core i7-3740QM
Gentoo Linux (~amd64)
kernel-5.4.3 (CONFIG_DRM_AMDGPU=y and CONFIG_DRM_AMD_DC=y on Desktop) / (CONFIG_DRM_RADEON=y on Notebook)
xf86-video-amdgpu-19.1.0 (Desktop) / xf86-video-ati-19.1.0 (Notebook)
mesa-19.3.0 (Desktop) / mesa-19.2.7 (Notebook)
llvm-9.0.1_rc3 (Desktop) / llvm-9.0.0 (Notebook)
v1.67 right now but happened at least since v1.62