On 10/05/2011 04:49 PM, DRC wrote: > On 10/5/11 3:38 PM, Eric Appleman wrote: >> An Nvidia Optimus laptop is a laptop that has two GPUs: The dedicated >> Nvidia GPU that has no physical output or LVDS connection and the Intel >> GPU (sometimes on the CPU die) that displays the desktop. >> >> The Nvidia GPU is typically wired through the Intel GPU and is only >> activated when needed (games, intense multimedia, etc). >> >> Here's a whitepaper: >> http://www.nvidia.com/object/LO_optimus_whitepapers.html >> >> As I mentioned before, VirtualGL is a very nice solution for hardware >> accelerated transportation. But we trade a fair amount of 3D performance >> and hardware feature exposure (NV17, VDPAU, etc) by using it. > So why do you use VirtualGL at all, then? Your statement above implies > that the machine already has a way of activating the GPU when needed, so > what advantage does VGL give you? > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2dcopy1 > _______________________________________________ > VirtualGL-Users mailing list > VirtualGL-Users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtualgl-users The Nvidia GPU can be activated (if not always on because of ACPI shortcomings), but there's no way to display what it renders.
The X server we assign to the Nvidia card has no means to display what it renders onto the Intel X server. We can't see the Nvidia desktop because it is invisible and has no physical output. Even if the Nvidia GPU is a secondary device on the same X server as the Intel GPU, it would still have to go through the Intel GPU to appear on the laptop screen or its outputs. As Bumblebee exists right now, VirtualGL is the means by which applications rendered on the invisible Nvidia desktop are brought onto the Intel desktop. Yes, it's convoluted and less than ideal, but it works. ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2dcopy1 _______________________________________________ VirtualGL-Users mailing list VirtualGL-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtualgl-users
