https://bugzilla.kernel.org/show_bug.cgi?id=77001
--- Comment #4 from Grzegorz Kowal custos.mentis@gmail.com --- I've got this again. This time with radeon.dpm=0 and power profile set to "low".
Sometimes when I switch the computer on, it seems that system does not initiate the GPU properly and monitor stays off. The system loads but with the following error:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000078 IP: [<ffffffff81337bc3>] radeon_driver_open_kms+0x83/0x200
The full log is attached.