dominik@dominik-pc:~$ sudo su
[sudo] password for dominik:
root@dominik-pc:/home/dominik# sudo lshw -C display  *-display
       description: VGA compatible controller
       product: 4th Gen Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 06
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:43 memory:b9000000-b93fffff memory:a0000000-afffffff ioport:5000(size=64)
root@dominik-pc:/home/dominik# echo ON > /sys/kernel/debug/vgaswitcheroo/switch
root@dominik-pc:/home/dominik# echo DIS > /sys/kernel/debug/vgaswitcheroo/switch
root@dominik-pc:/home/dominik# sudo lshw -C display  *-display
       description: VGA compatible controller
       product: 4th Gen Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 06
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:43 memory:b9000000-b93fffff memory:a0000000-afffffff ioport:5000(size=64)
root@dominik-pc:/home/dominik#