https://bugs.freedesktop.org/show_bug.cgi?id=77533
--- Comment #15 from vebveb@hotmail.fr --- I have tested to return V_009910_ADDR_SURF_16_BANK in case 8 in si_num_banks, instead of V_009910_ADDR_SURF_8_BANK, and unigine have no glitches anymore.
I test your patch right away.