> Try to reduce the bus speed to 10kbps Nope: #define I2C_SPEED_REGISTER 260 // ~10k [ 117.860961] si2168 1-0067: downloading firmware from file 'dvb-demod-si2168-b40-01.fw' [ 118.958355] si2168 1-0067: firmware version: B 4.0.25 [ 118.968882] si2157 2-0063: Bogus chip version, trying with new firmware [ 118.968888] si2157 2-0063: found a 'Silicon Labs Si21255-\xff\xff\xff' [ 118.972005] si2157 2-0063: downloading firmware from file 'dvb-tuner-si2157-a30-01.fw' [ 121.154130] si2157 2-0063: rebooting tuner... [ 121.169626] si2157 2-0063: querying firmware version... [ 121.172799] si2157 2-0063: firmware version: \xff.\xff.255 [ 121.172803] si2157 2-0063: querying chip revision... [ 121.175911] si2157 2-0063: chip revision: 255.255.255.255 g -- g