On Thu, Nov 6, 2014 at 11:35 PM, Sean Paul <seanpaul@xxxxxxxxxxxx> wrote: >>> Proposal: Only shut down anything (and then the hole output pipe with all >>> cloned outputs) when all connector's dpms property is set to off. And >>> enable it again as soon as one property goes to on. >> >> Well, it isn't quite the behavior I would expect.. at least not if >> atomic ioctl has a "preserve properties not explicitly set" mode. I >> would expect one of the displays to turn off. Or at least go black >> (but preferably off..) >> > > Maybe we could just fail the atomic check in this case? Oh, I missed this bit a bit. We can't disable the output on the first dpms off for a connector, since if there's 1 connector left on stuff like vblank waits or page flips need to keep working. And maybe there's crazy userspace out there which needs that to not die in a racecondition. But keeping the screen running for a bit longer will not be noticeable since all compositors always do dpms on all outputs anyway. So from a "what does the user see" pov disabling when the first or last cloned connector get dpms off set doesn't matter, but from an userspace pov there's a difference. All this only matters for cloned configs anyway only, which is about i915 for gen2, roughly. Well Ville implemented cloning for some more recent stuff too. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
