Since the systemd-change the vgaswitcheroo-methods do not work. Solution for me was: 
Just created aur package for systemd because the lack of support of the current package. The package is located at:  Needs testing of course although working for me.
Alternatively, the commands previously placed in rc.local,
- modprobe radeon
- echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
can be moved to /etc/profile.d/yourscript.sh
X.org server 1.14
I recently switched to FOSS radeon driver and I have laptop with two ATI video cards, so currently I am researching xorg configuration and found that, in fact, there is support for the redering on a second card not attached to video according to feature matrix. But unfortunately I haven't found out the way to use it yet. MRWITEK (talk) 17:40, 29 August 2013 (UTC)