So after using my trusty Sapphire Radeon HD 4890 for over six years (with open source radeon driver) I decided to renew my graphics device, again with a Radeon card from Sapphire. I chose the model R9 285 which has a so called Tonga chip on it and thus requires the quite new amdgpu driver instead of radeon.
Well, long story short, even with the latest 4.5.x kernel version the card doesn't work in my system. The 4.2.x and 4.3.x kernel series ran into kernel panics where 4.5.x kernel series only blanks the screen and shows some error messages in dmesg output.
I've opened up a bug report but with no response yet from anybody. I wonder if it's my quite old Tyan mainboard which only provides PCI-E of the first generation but without any kernel developer at least looking at the bug I'm quite lost here. Seems like I now own a brand new AMD Radeon card which I cannot use other than letting it collect dust in my shelf.
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