You have to run: sudo amdconfig --initial -f after you install the fglrx-* packages.
If it still doesn't work you might need to additionally run this: sudo amdconfig --px-dgpu
You have to run:
sudo amdconfig --initial -f
after you install the fglrx-* packages.
If it still doesn't work you might need to additionally run this:
sudo amdconfig --px-dgpu