xfree-drm (and possibly others) have VIDEO_CARDS checks that cause portage to spew out numerous IUSE QA notices similar to the following...
QA Notice: USE Flag 'video_cards_radeon' not in IUSE for x11-base/x11-drm-20040827
Please have the checks consider USE_EXPAND.
Created attachment 66114 [details, diff]
make useq not be stupid
*** This bug has been marked as a duplicate of 70648 ***