Comment # 18
on bug 59982
from Jerome Glisse
So when all register return 0xffffffff it's because something went horribly wrong. Either the GPU memory controller is lockup or in bad or the IOMMU is blocking things. My guess is that enabling the crtc to start scanning trigger request to the GPU memory controller and those request points to bad address. I would tripple check the memory controller setup and that the crtc base register points to valid vram inside the GPU memory address space.
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