Hi all, We encountered an issue that while switching to power saving mode(use iGPU), the power consumption goes up to 40 Watt, and after removed i2c_nvidia_gpu, it becomes 5 Watt. I've tried to check the driver to see if it can tell it's under power saving mode and found that the first time you call gpu_i2c_check_status(), it got 0 from readl(), and the second and the following readl(), it returns 0xe0000000. It looks like an error code combined with I2C_MST_CNTL_STATUS_NO_ACK and I2C_MST_CNTL_STATUS_TIMEOUT. Moreover, i2c_nvidia_gpu module seems depends on intel_lpss driver since it provides i2c interface. So if we can to use the above behavior to check its status, the system have to load intel_lpss first. But currently, it seems not possible to load modules in our order. So, I'm wondering if we have other method to check and not load i2c_nvidia_gpu module or if it's possible to check why loading i2c_nvidia_gpu affects power consumption a lot. Thanks. Best regards, AceLan Kao.
