Hello Helge, On 08/07/2016 11:37 AM, Helge Wiemann wrote: > apt install i2c-tools > echo 0-0030 > /sys/bus/i2c/devices/0-0030/driver/unbind > i2cget -y 0 0x30 0x80 > > This is what you asked for: > > 1) -bash: echo: write error: No such device > 2) no output > 3) i2cget -y 0 0x30 0x80 > 4) -bash: echo: write error: No such device > > Trace & system log are attached. Your i2c bus is stuck, probably because the rtc pulls down the SDA line. Can you make your machine completely voltage free for a moment? That is remove any power cords and a maybe existing backup battery. If you are able to locate the chip on your pcb, there must be 0 V between pin 4 (VSS) and pin 8 (VDD). Best regards Uwe
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