Designware I2C Controller: Warning: NACK for slave address...
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Date: Fri, 12 Sep 2025 21:32:25 UTC
Hi, after an update to main (say from beginning of June/July) these started appearing. How can one find out what they are supposed to talk to? This is on an f.w16. # dmesg -a | grep ig4iic1 ig4iic1: <Designware I2C Controller> iomem 0xfedc5000-0xfedc5fff irq 6 on acpi0 ig4iic1: Controller parameters: iicbus1: <Philips I2C bus (ACPI-hinted)> on ig4iic1 ig4iic1: message with no data ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c ig4iic1: Warning: NACK for slave address 0x2c -- Bjoern A. Zeeb r15:7