So one of the problems I want to solve for KMS it the what to do when nothing is plugged in at startup, I've fixed this for fbcon in the current tree, but when looking at X + randr clients I realised it needed a bit more work.
I've pulled the polling code back into the core, and it nows can send uevents to userspace when something changes. The drivers can specify flags for each output as to whether it is hotplug capable, needs connection polling and can handle disconnection polling. A lot of outputs can't handle disconnection polling due to DAC polling causing flicker on the current output. Also things like s-video shouldn't be polled for connect or disconnect esp if sharing a dac with a VGA output. So with patch one, we can boot, start X all without anything connected, however it runs into an issue which patch 2 is an attempt to fix. So at startup X drivers genearlly seem to ask for a list of connectors and status for them, and if it can't find any connected, it goes to unknown, and if none of those they fall over and X exits. Idea 1 was to just pick a connector and claim it is connected when nothing else is, however this falls over, for DVI esp on a dual-DVI card. You pick a DVI connector, claim it is connected, you most likely end up turning on the analog portion of it, you hotplug a digital connector and the uevent gets sent, the client app repolls the connector status, sees the connector is still connected so doesn't do anything. Forcing a disconnect/connect is incredibly racy and hard. So Ben Skeggs suggested we just fake a disconnected connector for this case. It looks a bit messy in xrandr, but from what I can see the gnome client ignores it as it should. Anyways any other ideas on how this might be tackled or improvements that could be made? Dave. ------------------------------------------------------------------------------ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
