OzanH

When you run your Debian or Ubuntu under Microsoft's Hyper-V, you may encounter the following error at startup.

piix4_smbus 0000:00:07.3: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr

Since error is beacuse of absense of smbus, you can fix the annoying error by using the following instructions.

First check if the module is loaded

lsmod | grep i2c_piix4

If it is loaded (if you have the error it must be loaded), open the file /etc/modprobe.d/blacklist.conf file with your favorite text editor

nano /etc/modprobe.d/blacklist.conf

Then append the following line to the file and save it.

blacklist i2c_piix4

After all, run this to update the initramfs

update-initramfs -u -k all

After rebooting you will not see the same error message or you can check it with dmesg (to see boot messages)

dmesg

Enjoy.