https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #169 from Francisco Pina Martins f.pinamartins@gmail.com --- I would like to add something to this. On my Mobility 3650 (rv635/M86), I can normally boot with DPM without any issue at all since 3.11. However - sometimes (sporadically) I get the frosting screen when playing Freecol. When this happens, I can no longer boot with DPM enabled. If I don't disable DPM in my bootloader, I always get the frosting screen when modesetting was supposed to be happening. In order to be able to boot again, I have to disable DPM, boot and leave the computer on for a while (not sure how long, but less than 10 minutes is insufficient and over 1 hour is enough). If I do this, DPM will work again just fine. I have no idea why this happens, and I am not sure what to log when it does (actually, nothing gets logged on the failed boots).