Garrett D'Amore wrote: > > "primary-card" is a terrible name -- how about "primary-display" > instead? (The primary display may be on the motherboard!) > > What is the purpose of this, is it for console support? No. It determines which graphics device on the system should be used as the default device for X, especially in the case where there are multiple graphics devices (not displays connected to a graphics device).
It is independent of the console as the console may be a non-graphics device. > > How is the decision about whether a display the primary or not made? > Is this user-configurable? Does it access underlying BIOS > structures? What about in unconventional configurations, such as > display mirroring or TwinView? This is implementation defined. On x86, the default graphics device is the one for which the SBIOS has enabled I/O cycles on the entire devices path. Which device is chosen is usually controlled by a BIOS probe option. On SPARC, this will be the first graphics device in the tree which can be controlled by the probe-list words. Display mirroring or TwinView implies multiple displays driven of a single graphics device. Choosing between multiple displays connected to a single device is not the scope of this project.
