https://bugs.freedesktop.org/show_bug.cgi?id=63599
--- Comment #23 from wojtek wojtask9@wp.pl --- (In reply to comment #13)
Try comparing the following registers between fglrx and radeon:
difference:
left (fglrx) right(rad)
GB_ADDR_CONFIG -0x98F8 0x02010002 (33619970) +0x98F8 0x02010001 (33619969)
CGTS_SYS_TCC_DISABLE -0x3F90 0x00000000 (0) +0x3F90 0xff000000 (-16777216)
CGTS_TCC_DISABLE -0x9148 0x00000000 (0) +0x9148 0xff000000 (-16777216)
CGTS_USER_SYS_TCC_DISABLE -0x3F94 0x00000000 (0) +0x3F94 0xff000000 (-16777216)
CGTS_USER_TCC_DISABLE -0x914C 0x00000000 (0) +0x914C 0xff000000 (-16777216)
PA_SC_FORCE_EOV_MAX_CNTS -0x8B24 0x00ff0fff (16715775) +0x8B24 0x00ff3fff (16728063)
SMX_DC_CTL0 -0xA020 0x00158009 (1409033) +0xA020 0x00020009 (131081)
SPI_CONFIG_CNTL_1 -0x913C 0x00000004 (4) +0x913C 0x00000000 (0)
VGT_CACHE_INVALIDATION -0x88C4 0x000000c1 (193) +0x88C4 0x000000c2 (194)