Thanks for the report. 80c0: 68 48 20 2c 2c 6c 6c 6c 65 65 44 65 28 4c 20 44 the 0x48 means that DATA line of smbus is forced low so the bus is stuck. The bit 5 offers the realtime status of the bus line. (http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/23167.pdf page 83) When the bus is stuck again you may try following: rmmod i2c-amd756 Now lets reprogram the chipset to force 1 to the DATA line, if the isadump will be 0x68 then the chipset has some bug otherwise some device on the bus has the bug. isaset -y -f 0x80c0 0x5 isaset -y -f 0x80c1 0x5 isadump -y -f 0x8000 Regards Rudolf Thanks, regards Rudolf