Hi MacMan,
I tried hard to work my HD6770m.
In Chimera 1.8 there should be this:
{ 0x6740, 0x1631103C, CHIP_FAMILY_TURKS, "AMD FirePro M5950", kNull },
{ 0x6740, 0x3388103C, CHIP_FAMILY_TURKS, "AMD Radeon HD 6770M", kNull },
My bdmesg shows this:
AMD Radeon HD Series 6700m 4095MB [1002:6740]...