Maybe 810 will be nicer to ati cards, but after battling with my ati 2600hd pro card trying to get it to work properly for awhile, I scrapped it and found an old nvidia 5950 that ... sadly, even being a million years older, works 10x better with linuxmce....
My best advice would be to do the same, I had the same quirks, I was always so close to getting it to behave properly... I'm glad I just ripped it out and got an old nvidia card for now...