Hi, the nvidia/intel optimus cards built into many laptops can be used with the intel driver but the second unused nvidia card causes a lot of heat and power drain. Jukka Ruohonen explained how to switch this off with a kernel module. On my system small changes were necessary, which I would like to document to help other users of this graphic card. The basis is Jukka's small howto in: http://mail-index.netbsd.org/netbsd-users/2012/08/31/msg011341.html
My laptop is an Asus R503V i3 with a Geforce 610M (X55VD 1.0 in dmesg). The relevant parts about the graphic cards in dmesg are acpivga0 at acpi0 (PEGP): ACPI Display Adapter acpivga1 at acpi0 (GFX0): ACPI Display Adapter vga0 at pci0 dev 2 function 0: vendor 0x8086 product 0x0166 (rev. 0x09) In Jukka's nvidia.c I had to change the two defines #define NVIDIA_ON "\\_SB.PCI0.PEG1.GFX0._ON" #define NVIDIA_OFF "\\_SB.PCI0.PEG1.GFX0._OFF" into #define NVIDIA_ON "\\_SB.PCI0.PEG0.PEGP._ON" #define NVIDIA_OFF "\\_SB.PCI0.PEG0.PEGP._OFF" I deduced this by running acpidump -dt | less as root and searching for the string '_OFF'. All other occurences have no connection with graphic cards and PEGP is the ACPI name shown in the dmesg line for acpivga0. I am sure this will be different on other systems, but this should lead your way. After building the module nvidia.kmod do a modload ./nvidia.kmod and within seconds the fan will begin to slow down as the temperature lowers. envstat shows only a slight decrease of temperatures by about 8 degrees in my case, but the fans are no longer running at high speed to cool the system. Thank you Jukka! No more noise and heat on my system. Kai-Uwe
