For dedicated notebook graphic card power saving is probably a bigger issue, but with a IGP card, with a normal sized notebook it works pretty fine with the free Radeon driver too. At least for me.
And if you enter "echo low > /sys/class/drm/card0/device/power_profile" it will probably help with power saving a bit. Maybe it's 2 or 3° degree cooler then. Just add it to the startup script of you distro. Under Fedora it is /etc/rc.d/rc.local