Dear list, as Matthew Macy informed a few weeks ago, he is in the process to port linux 4.6 DRM/KMS drivers to FreeBSD using the linuxkpi wrapper. We are now at the point that the amdgpu attaches and does useful stuff thanks to him. However, the AMD hardware we use for testing behaves rather erratically and we are a bit at loss to understand this behavior. Namely, we have a few APUs that don't even pass ring attachment (this is for another day). Fortunately, my A12-8800B does not suffer from this, it has serious issues with displays though. The internal display simple does not display anything (the driver seems to disconnect the internal display), one tested external displayport monitor works correctly, another does not at all. Since the code is not too verbosely documented, we are a bit at a loss where to look for problems and would appreciate pointers a lot! Please see a verbose log of amdgpu/drm at http://pastebin.com/nmh6xzqq showing amdgpu attaching with the internal display (1920x1080) and a working external display (2560x1440) connected via displayport. This is simple console, no X involved. After amdgpu attaches, I get a working console on the external display and nothing on the internal. Ideally, I am looking for information what fails for the internal display and where to look to fix it based on the log. I am happy to provide any other information necessary. Thanks for any help, we truly appreciate it! Johannes
