Been looking around my DSDT.dsl file and found that using 
\_SB.PCI0.PEGP.VGA._OFF probably turns off my discrete graphics card.
After I run echo '\_SB.PCI0.PEGP.VGA._OFF' > /proc/acpi/call the laptop runs 
abit cooler, and the lspci -v gives me 
01:00.0 VGA compatible controller: nVidia Corporation Device 0a69 (rev ff) 
(prog-if ff)
        !!! Unknown header type 7f

echo '\_SB.PCI0.PEGP.VGA._ON' > /proc/acpi/call the temperature increases 
almost instant. and lspci -v produces
01:00.0 VGA compatible controller: nVidia Corporation Device 0a69 (rev a2)
        Subsystem: Hewlett-Packard Company Device 142e
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at f0000000 (32-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at 4000 [disabled] [size=128]
        Expansion ROM at f1080000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel modules: nvidiafb, nouveau


I'am using an HP DM3-1130eo laptop. (see comment above)

-- 
support graphics card hot switch
https://bugs.launchpad.net/bugs/312756
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