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Today it is failing to start with: Well, that is rather old hardware. I suggest to make sure first that the hw isn't broken in some way. > How should I go and debug this (other than plain git-bisect) ? You first need to figure out what's the failing component. Either Mesa, DDX or the Kernel are possible candidates. Another possibility is that you updated kodi and kodi is now doing something the hw doesn't like. Regards, Christian.