Hi all, I wonder if there is a way to disable or power off the built-in graphics device that is integrated in chipset if it is not used for most of the time, for instance, on servers. What I have tried is, experiment on Q45 chipset, set bit 3 and 4 of register 'deven' at offset 54-57h in the PCI configuration space belonging to device 0 function 0. The datasheet of Q45 tells setting these bits can disable the internal graphics(deveice 2 function 0 and 1). I tried and it turned out that if the VGA cable is connected, setting the bits leads up to shut-off of signal and the power meter shows less dissipation. That is great. But if I unplug the VGA cable, I can also see the same drop in degree as much as which if I disable the device. That means if cable is unconnected, disable the device cannot further reduce the power consumption. So I am guessing the graphics device is not fully powered off by this method. The questions goes, is there any way which can fully power off the device or at least put it into much much lower power state. If that is possible I can do it on our online servers to save energy. The sever is Atom based platform with GMA 3150 graphics integrated. Thanks, Joseph** -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20111116/5e495760/attachment.html>
