From reading the code it is not immediately obvious to me how KMS allows for the following boot up behavior and configurations:
1. Start up with a 2048x768 surface and set each of the two CRTCs (at 1024x768 timings) to display left/right half of the screen,
2. Allow for "seamless" mode set, i.e. let the vendor's DRM to report that the current mode (set by the VBIOS for example) is the same as the switch-to mode, and therefore don't turn off the connectors and CRTCs. This avoids unnecessary flashes on the screen at boot time.
3. Start up in clone without specifying "video=", and not going into 1024x768. We would like to start up in a user-specified mode in clone configuration.
We have a highly configurable driver, and we need to be able to control exactly how the display(s) come up. I'm trying to figure out if there is a way to do this and still play nice with KMS's initialization sequence.
Are any of those possible under KMS at this time?
Thanks,
Sinclair