Comment # 175
on bug 66963
from Jaime Velasco Juan
Created attachment 91835 [details] [review] Disable the DMA ring in R6xx Hi, I've got an RV620 (HD3450/3470, pci id 1002:95c4). It usually worked with dpm, but hanged on boot maybe 1/10 times. I've been testing the dpm-reorder branch (now drm-next-3.14) and I haven't seen it hang since then. However, with this branch I got the following: [drm:r600_dma_ring_test] *ERROR* radeon: ring 3 test failed (0xCAFEDEAD) and acceleration got disabled. This starts happening with "drm/radeon/pm: move pm handling into the asic specific code". I think the DMA ring is not used by mesa nor xf86-video-ati so I changed the kernel to skip initialisation of the DMA ring and keep acceleration and with that I've had it working every time (can suspend/resume as well). I can't be sure this is the cause as the hangs are random, but the results seem promising so far.
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