Error starting GDM with AMD Radeon HD 6550D
Originally created by @goupille on #17546 (Redmine)
this GPU is not listed in the known issues
full name of the GPU :
advanced micro devices, Inc. [AMD/TI] Beavercreek [Radeon HD 6550D] [1002:9640]
the following workaround fixes the issue :
radeon.modeset=0