My setup is a asus t53A with AMD A6-3400M APU with Radeon(tm) HD Graphics (4 CPUs), ~1.4GHz 6720G2. This setup uses the 6520G as its primary adapter and the GPU AMD Radeon HD 6600M Series as a linked adapter.
Both shogun 2 and rome 2 recognizes the 6520G with its proper memory of 1536 mb (6520G:512mb and 6600M series:1024mb) When i play Shogun 2 the 6600M kicks in and supports the 6520G (with great results on high settings). With rome 2 the 6600M does nothing. Explaining all the ****. I cant change settings in the bios and can not try the high performance trick in the controle center (powerplay!?) or any other trick. Drivers are updated as is bios.
Switching off crossfire automatically cuts off the 6600M as it is the linked adapter.