I did as Acidphase suggested:
Xorg -configure returned error, last lines said:
Code:
[ 35.741] Number of created screens does not match number of detected devices.
Configuration failed.
Full log at openpaste.org/dEBa1329
xorg.conf.new: openpaste.org/cE027C2A
About
aticonfig --px-dgpu, no use, high performance mode is active and has always been.
lspci -v output: openpaste.org/07cb7662
finally
aticonfig --adapter=all --initial is at openpaste.org/D44E108F
Thanks, I gave up trying different configurations. I hope you can still help.