How to disable discrete graphics card in Fedora 22 / 23 / 24 or above

Overheating is a headache for fedora users with non supporting discrete graphics card. Here is the method to disable the discrete graphics card.

In new fedora, we cannot easily change the DynOff state to Off for discrete graphics card.

Follow below steps:

1. Open terminal.
2. Get super user permission by typing su -l
3. Enter password
4. Type gedit /etc/default/grub
5. Change GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet" to GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet quiet splash radeon.modeset=0"
6. Save the file. Close. Go back to terminal.
7. Type  grub2-mkconfig -o /boot/grub2/grub.cfg
8. Then type sudo echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
9. Type cat /sys/kernel/debug/vgaswitcheroo/switch and see the status changed to Off
10. Now go to /etc/rc.local and add echo OFF > /sys/kernel/debug/vgaswitcheroo/switch to it and save.
11. Done