On 09/08/2014 11:37 PM, Keith Packard wrote: > With atomic mode setting in the kernel, I think you're probably right in > proposing to eliminate explicit CRTC allocation from that. I do think > you'll want to indicate the number of available CRTCs in the display > engine, and the number of CRTCs each monitor consumes. Do you know if > there are some of these monitors that can display lower resolution modes > with only a single CRTC? Or is the hardware so separate that you end up > always using multiple CRTCs to drive them?
The one I tried definitely can; indeed it has to because the VBIOS doesn't know how to set up MST and drives the port in DP 1.1 mode. I'm sure someone will build a monitor that only turns on half of the display if you do that, but I'd be kind of surprised if someone made one that just doesn't work if you use a DP 1.1-only GPU. -- Aaron
