# prog/dump/i2cdump 0 0x50 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00: 80 08 04 0c 08 01 40 00 01 a0 60 00 80 10 00 01 ??????@.??`.??.? 10: 8f 04 04 01 01 00 0e 00 00 00 00 14 14 14 32 08 ?????.?....???2? 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 12 a2 ..............?? 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 62 00 ..............b. 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 64 c4 ..............d? 80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ 90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ I think that the problem is in fact in i2c-voodoo3.o because there was some scanlines offseted by 1 pixel to the left when the module was loaded and this was hard to be seen. When I removed the module and restarted the machine all came back to normal.