how can i check whether graphics driver was succesfully loaded via io-graphics? because there’s no message but it still doesn’t work 
or how can i see loaded drivers like (e.g. lsmod)
“pidin mem” will show you all the loaded libs in a process. Drivers are just libs to io-graphics so you should see the loaded drivers from there (look for devg-xxx)
one other thing…io-graphics usually spits out it’s messages to slogger, so doing a “sloginfo” will give some more information.