View Single Post
Old 08-01-07, 12:25 AM   #4
NVIDIA Corporation
AaronP's Avatar
Join Date: Mar 2005
Posts: 2,487
Default Re: Nvidia when are you going to implement XRandR 1.2 in your driver?

What do you mean by "core" code? As I mentioned in the other thread, there is some confusion when people say "Xinerama" because they're not clear on whether they mean the protocol extension or the implementation in the server. There are three major implementations of the Xinerama protocol today:
  1. The Xinerama implementation in the server, enabled by Option "Xinerama" in xorg.conf.
  2. The "TwinViewXineramaInfo" implementation in the NVIDIA X driver.
  3. The "fakerama" implementation in RandR 1.2.
№1 is incompatible with RandR (both 1.1 and 1.2). №2 is incompatible with Xinerama in that the TwinView screens will show up as one big screen according to the Xinerama protocol.

RandR 1.2 requires that any "CRTC" (basically a display device) be able to be placed anywhere on the desktop. This precludes being able to use multiple GPUs. A future revision of RandR will add GPU objects that can restrict the placement of CRTCs and allow a single RandR screen to span multiple GPUs.
AaronP is offline   Reply With Quote