Comment # 8 on bug 59672 from Lucas Kannebley Tavares

Hi Michael, the patch you provided did indeed get rid of all errors, but now
modprobe enters an infinite loop on the test that previously failed

[   62.294510] [drm] ring test on 0 succeeded in 0 usecs
[   62.294578] [drm] ring test on 3 succeeded in 1 usecs
[   62.294901] [drm:evergreen_irq_set], evergreen_irq_set: sw int gfx
[   62.294943] [drm] ib test on ring 0 succeeded in 0 usecs
[   62.294989] [drm:evergreen_irq_set], r600_irq_set: sw int dma
[   62.721958] [drm:evergreen_irq_set], r600_irq_set: sw int dma
[   62.731965] [drm:evergreen_irq_set], r600_irq_set: sw int dma
[   62.741979] [drm:evergreen_irq_set], r600_irq_set: sw int dma
...
[  434.061917] [drm:evergreen_irq_set], r600_irq_set: sw int dma

Just saw your last comment and so I'm off to change remove FENCE_SWAP_ENABLE. 
Thanks